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10x+18=x-81
We move all terms to the left:
10x+18-(x-81)=0
We get rid of parentheses
10x-x+81+18=0
We add all the numbers together, and all the variables
9x+99=0
We move all terms containing x to the left, all other terms to the right
9x=-99
x=-99/9
x=-11
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