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12x-145=x+108
We move all terms to the left:
12x-145-(x+108)=0
We get rid of parentheses
12x-x-108-145=0
We add all the numbers together, and all the variables
11x-253=0
We move all terms containing x to the left, all other terms to the right
11x=253
x=253/11
x=23
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