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12x-90=53+x
We move all terms to the left:
12x-90-(53+x)=0
We add all the numbers together, and all the variables
12x-(x+53)-90=0
We get rid of parentheses
12x-x-53-90=0
We add all the numbers together, and all the variables
11x-143=0
We move all terms containing x to the left, all other terms to the right
11x=143
x=143/11
x=13
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