Thank you for the opportunity to help you with your question!

a = -5

-(5-(a+1)) = 9-(5-(2a-3)) Always do the inner-most parentheses first. When distributing a minus sign to the parenthesis, the signs will be switched. Example: 5-(2a-3) becomes 5-2a+3

-(5-a-1) = 9-(5-2a+3) Now simplify what's in the parentheses on both sides of the equations.

-(4-a) = 9-(8-2a) Distribute negative sign to what's inside the parenthesis.

-4+a = 1+2a Subtract 'a' to the right side and subtract '1' to the left side.

-5 = a

Please let me know if you need any clarification. I'm always happy to answer your questions.