Final answer:
To simplify the given rational expression, factor out -1 from the denominator and cancel out the common factor in the numerator and denominator.
Step-by-step explanation:
To simplify the rational expression 5x+7/7-5x, we can factor out -1 from the denominator to rewrite it as -(5x+7)/(5x-7). Now, we can cancel out the common factor of (5x+7) in the numerator and denominator, leaving us with -1/(5x-7) as the simplified expression.
Learn more about Simplifying rational expressions