1. Find the |x| meaning absolute value, which is just turning everything in the lines positive.
So |11-4x|=21 would be 11+4x=21
Then subtract 11 from both sides to get x alone
11-11 +4x = 21-11
4x= 10
Then divide both sides by 4 to find the variable
4x/4=10/4
X=2.5
