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-155-3x=-12x+115
We move all terms to the left:
-155-3x-(-12x+115)=0
We get rid of parentheses
-3x+12x-115-155=0
We add all the numbers together, and all the variables
9x-270=0
We move all terms containing x to the left, all other terms to the right
9x=270
x=270/9
x=30
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