Use properties of real numbers to rewrite the expression -2(x+4)=-2x-8

First we will distribute the first part of the equation
-2 (x + 4)
-2x - 8
now put it back into the equation
-2x - 8 = -2x -8
add 8 to both sides
-2x + 0 = -2x + 0
add 2x to both sides
0 + 0 = 0 + 0 
0 = 0

Hope this helps :)

You're doing something i dont know how to do but search up on google slope calculator maybe that will get you there