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-2x-66=84+4x
We move all terms to the left:
-2x-66-(84+4x)=0
We add all the numbers together, and all the variables
-2x-(4x+84)-66=0
We get rid of parentheses
-2x-4x-84-66=0
We add all the numbers together, and all the variables
-6x-150=0
We move all terms containing x to the left, all other terms to the right
-6x=150
x=150/-6
x=-25
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