9(1g-10)-4g=8g+27

9(1g-10)-4g=8g+27

9g - 90 - 4g = 8g + 27    Simplify a bit

5g-90 = 8g+27               Subtract 5g from both sides

-90 = 3g + 27                Subtract 27 from both sides

-117 = 3g                    divide both sides by 3

-39 = g