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-9x-141=3x+39
We move all terms to the left:
-9x-141-(3x+39)=0
We get rid of parentheses
-9x-3x-39-141=0
We add all the numbers together, and all the variables
-12x-180=0
We move all terms containing x to the left, all other terms to the right
-12x=180
x=180/-12
x=-15
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