Question 195043
Find the value of x: 
-20-x=-12 
. 
The idea is to isolate the unknown (in this case, 'x') to one side of the equation (doesn't matter which side).
.
-20-x=-12 
Add x to both sides:
-20-x+x = -12+x
-20 = -12+x
Add 12 to both sides:
-20+12 = -12+x+12
-8 = x