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165+15x=x-353
We move all terms to the left:
165+15x-(x-353)=0
We get rid of parentheses
15x-x+353+165=0
We add all the numbers together, and all the variables
14x+518=0
We move all terms containing x to the left, all other terms to the right
14x=-518
x=-518/14
x=-37
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