Question

Solve.

Answer 1

Well you want to distribute the negative sign so it will be a lil easier to solve 

so  -(-w+6) becomes (w-6)

now plug in each value
 a. 3-6 = -3
b. -7-6= -13
c. -3-6= -9
d. 7-6= 1

Answer 2

$1=-(-w+6) \ \ \ \ | omiting\ the\ bracket\\\\ 1=w-6\ \ \ \ | add\ 6\\\\ w=7\\\\Solution\ is\ D.$