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-54-4x=-12x+66
We move all terms to the left:
-54-4x-(-12x+66)=0
We get rid of parentheses
-4x+12x-66-54=0
We add all the numbers together, and all the variables
8x-120=0
We move all terms containing x to the left, all other terms to the right
8x=120
x=120/8
x=15
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