Question

N = n - g*w
solve for g

Answer 1

N=n-g(w)
-n both sides
N-n=-g(w)
/-w both sides
N-n/-w = g

Answer 2

g = - (N-n) / w

Explanation:

N - n = -g*w

(N-n) / w = -g

- (N-n) / w = g

hope this helps! <3