81=18+7m

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Solution for 81=18+7m equation: 



81=18+7m

We move all terms to the left:

81-(18+7m)=0

We add all the numbers together, and all the variables

-(7m+18)+81=0

We get rid of parentheses

-7m-18+81=0

We add all the numbers together, and all the variables

-7m+63=0

We move all terms containing m to the left, all other terms to the right

-7m=-63

m=-63/-7

m=+9

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