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-8x+54=4x-66
We move all terms to the left:
-8x+54-(4x-66)=0
We get rid of parentheses
-8x-4x+66+54=0
We add all the numbers together, and all the variables
-12x+120=0
We move all terms containing x to the left, all other terms to the right
-12x=-120
x=-120/-12
x=+10
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