81=18+9x

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Solution for 81=18+9x equation: 



81=18+9x

We move all terms to the left:

81-(18+9x)=0

We add all the numbers together, and all the variables

-(9x+18)+81=0

We get rid of parentheses

-9x-18+81=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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