First, we multiply the parentheses by 4: 4x2= 8g, 4x18= 72
-16+8g-72=0
Now, calculate the difference: -16-72 = 16+72= -88
-88+8g=0
Move: -88+8g+88=0+8. And then eliminate the opposites (and the zero) 8g=88.
Divide between eight, so, is equal to g=11
(I'm bad explaining lol)