Since a and b are both factors, cancel this fraction by dividing by both a and b from the top and bottom ... You should notice the common factor of \(x + 2\) on the numerator and denominator ...

dfrac{4 (2x - 5) - 15 (x - 1)}{10}\) The method used for multiplying or dividing algebraic fractions is similar ... and denominator Divide top and bottom by any common factor Simplify where ...