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126-2x=4x+54
We move all terms to the left:
126-2x-(4x+54)=0
We get rid of parentheses
-2x-4x-54+126=0
We add all the numbers together, and all the variables
-6x+72=0
We move all terms containing x to the left, all other terms to the right
-6x=-72
x=-72/-6
x=+12
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