Given: (5y-3)-(-2y-7)
First, remove the parenthesis by distributing. The negative in front of the second set of parenthesis distributes to the -2y and -7:
5y-3+2y+7
Combine like terms:
7y+4 is your answer. We are not required to solve for y, according to the directions.
Answer:
(5y-3)-(-2y-7)=7y+4