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11x-18=2x-81
We move all terms to the left:
11x-18-(2x-81)=0
We get rid of parentheses
11x-2x+81-18=0
We add all the numbers together, and all the variables
9x+63=0
We move all terms containing x to the left, all other terms to the right
9x=-63
x=-63/9
x=-7
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