diff --git a/__pycache__/fraction.cpython-312.pyc b/__pycache__/fraction.cpython-312.pyc
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diff --git a/__pycache__/test_fraction.cpython-312.pyc b/__pycache__/test_fraction.cpython-312.pyc
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diff --git a/fraction.py b/fraction.py
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+++ b/fraction.py
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+from fractions import Fraction
+
+class FractionCalculator:
+
+    def calculate(self, expression: str):
+        """
+        Takes input like '4/5+3/5' or '4/5 + 3/5'
+        Returns simplified fraction result
+        """
+
+        expression = expression.replace(" ", "")
+
+        # detect operator
+        if '+' in expression:
+            a, b = expression.split('+')
+            return self._operate(a, b, '+')
+
+        elif '-' in expression:
+            a, b = expression.split('-')
+            return self._operate(a, b, '-')
+
+        elif '*' in expression:
+            a, b = expression.split('*')
+            return self._operate(a, b, '*')
+
+        elif '/' in expression:
+            # careful: division operator between fractions
+            parts = expression.split('/')
+            if len(parts) == 4:
+                a = parts[0] + "/" + parts[1]
+                b = parts[2] + "/" + parts[3]
+                return self._operate(a, b, '/')
+
+        raise ValueError("Invalid expression")
+
+    def _operate(self, a, b, operator):
+        try:
+            f1 = Fraction(a)
+            f2 = Fraction(b)
+        except ZeroDivisionError:
+            raise ValueError("Invalid fraction (zero denominator)")
+
+        if operator == '+':
+            result = f1 + f2
+        elif operator == '-':
+            result = f1 - f2
+        elif operator == '*':
+            result = f1 * f2
+        elif operator == '/':
+            if f2 == 0:
+                raise ValueError("Division by zero fraction")
+            result = f1 / f2
+
+        return f"{result.numerator}/{result.denominator}"
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diff --git a/test_fraction.py b/test_fraction.py
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--- /dev/null
+++ b/test_fraction.py
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+import unittest
+from fraction import FractionCalculator
+
+class TestFractionCalculator(unittest.TestCase):
+
+    def setUp(self):
+        self.calc = FractionCalculator()
+
+    # addition
+    def test_add(self):
+        self.assertEqual(self.calc.calculate("4/5+3/5"), "7/5")
+
+    # subtraction
+    def test_subtract(self):
+        self.assertEqual(self.calc.calculate("4/5-3/5"), "1/5")
+
+    # multiplication
+    def test_multiply(self):
+        self.assertEqual(self.calc.calculate("2/3*3/4"), "1/2")
+
+    # division
+    def test_divide(self):
+        self.assertEqual(self.calc.calculate("2/3/3/4"), "8/9")
+
+    # simplification
+    def test_simplify(self):
+        self.assertEqual(self.calc.calculate("2/4+2/4"), "1/1")
+
+    # invalid fraction
+    def test_invalid_fraction(self):
+        with self.assertRaises(ValueError):
+            self.calc.calculate("3/0+1/2")
+
+if __name__ == '__main__':
+    unittest.main()
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