Final answer:
To subtract fractions, we subtract the numerators and keep the common denominator. The final expression is x.
Step-by-step explanation:
To subtract fractions, we need a common denominator. In this case, the denominator is the same for both fractions, which is (3x + 5). Thus, we can directly subtract the numerators: (-8x) - (-9x) = -8x + 9x. Simplifying the expression gives us x. Therefore, the final expression is x.