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-9x-54=3x+54
We move all terms to the left:
-9x-54-(3x+54)=0
We get rid of parentheses
-9x-3x-54-54=0
We add all the numbers together, and all the variables
-12x-108=0
We move all terms containing x to the left, all other terms to the right
-12x=108
x=108/-12
x=-9
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