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x=2x-12=90
We move all terms to the left:
x-(2x-12)=0
We get rid of parentheses
x-2x+12=0
We add all the numbers together, and all the variables
-1x+12=0
We move all terms containing x to the left, all other terms to the right
-x=-12
x=-12/-1
x=+12
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