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-2x-215=-12x+55
We move all terms to the left:
-2x-215-(-12x+55)=0
We get rid of parentheses
-2x+12x-55-215=0
We add all the numbers together, and all the variables
10x-270=0
We move all terms containing x to the left, all other terms to the right
10x=270
x=270/10
x=27
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