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8x-54=12x+78
We move all terms to the left:
8x-54-(12x+78)=0
We get rid of parentheses
8x-12x-78-54=0
We add all the numbers together, and all the variables
-4x-132=0
We move all terms containing x to the left, all other terms to the right
-4x=132
x=132/-4
x=-33
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