Question

Simplify 9 - {x - (7 + x)}.


16
-2x + 2
-2x + 16
2x + 2

Answer 1

Always start with the innermost parenthesis
So, first you would distribute the negative after the x and would end up with
9-{x-7-x}
Then the two x's end up crossing out because one is positive and one is negative
9-{7}
So from here just do subtraction to get
9-7=2

Answer 2

thank you @cassieWOAH