Question

-84 = -5(2x + 4) - 4

Answer 1

x = 6

Explanation:

`-84=-5(2x+4)-4\qquad\text{add 4 to both sides}\\\\-84+4=-5(2x+4)-4+4\\\\-80=-5(2x+4)\qquad\text{divide both sides by (-5)}\\\\(-80)/(-5)=(-5(2x+4))/(-5)\\\\16=2x+4\qquad\text{subtract 4 from both sides}\\\\16-4=2x+4-4\\\\12=2x\qquad\text{divide both sides by 2}\\\\(12)/(2)=(2x)/(2)\\\\6=x\to x=6`

Answer 2

`-84 = -5(2x+4) - 4| *(-1)\\5(2x+4) + 4 = 84\\10x + 24 = 84\\10x = 84 - 24 = 60\\x = (60)/(10) = 6`