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-84-12x=-3x+60
We move all terms to the left:
-84-12x-(-3x+60)=0
We get rid of parentheses
-12x+3x-60-84=0
We add all the numbers together, and all the variables
-9x-144=0
We move all terms containing x to the left, all other terms to the right
-9x=144
x=144/-9
x=-16
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