Question

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

Answer 1

$-84 = -5(2x+4) - 4| *(-1)\\5(2x+4) + 4 = 84\\10x + 24 = 84\\10x = 84 - 24 = 60\\x = \frac{60}{10} = 6$

Answer 2

Answer:

x = 6

Step-by-step explanation:

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