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55-5x=-12x-85
We move all terms to the left:
55-5x-(-12x-85)=0
We get rid of parentheses
-5x+12x+85+55=0
We add all the numbers together, and all the variables
7x+140=0
We move all terms containing x to the left, all other terms to the right
7x=-140
x=-140/7
x=-20
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