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-4=-4x-20
We move all terms to the left:
-4-(-4x-20)=0
We get rid of parentheses
4x+20-4=0
We add all the numbers together, and all the variables
4x+16=0
We move all terms containing x to the left, all other terms to the right
4x=-16
x=-16/4
x=-4
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