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-4x+42=4x-54
We move all terms to the left:
-4x+42-(4x-54)=0
We get rid of parentheses
-4x-4x+54+42=0
We add all the numbers together, and all the variables
-8x+96=0
We move all terms containing x to the left, all other terms to the right
-8x=-96
x=-96/-8
x=+12
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