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12x-5x+170=12x-90
We move all terms to the left:
12x-5x+170-(12x-90)=0
We add all the numbers together, and all the variables
7x-(12x-90)+170=0
We get rid of parentheses
7x-12x+90+170=0
We add all the numbers together, and all the variables
-5x+260=0
We move all terms containing x to the left, all other terms to the right
-5x=-260
x=-260/-5
x=+52
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