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-12x-156=-3x+141
We move all terms to the left:
-12x-156-(-3x+141)=0
We get rid of parentheses
-12x+3x-141-156=0
We add all the numbers together, and all the variables
-9x-297=0
We move all terms containing x to the left, all other terms to the right
-9x=297
x=297/-9
x=-33
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