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12x-1=13x+81
We move all terms to the left:
12x-1-(13x+81)=0
We get rid of parentheses
12x-13x-81-1=0
We add all the numbers together, and all the variables
-1x-82=0
We move all terms containing x to the left, all other terms to the right
-x=82
x=82/-1
x=-82
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