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x+81=3x-10
We move all terms to the left:
x+81-(3x-10)=0
We get rid of parentheses
x-3x+10+81=0
We add all the numbers together, and all the variables
-2x+91=0
We move all terms containing x to the left, all other terms to the right
-2x=-91
x=-91/-2
x=45+1/2
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