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