9-(-8m)=81

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Solution for 9-(-8m)=81 equation: 



9-(-8m)=81

We move all terms to the left:

9-(-8m)-(81)=0

We add all the numbers together, and all the variables

-(-8m)-72=0

We get rid of parentheses

8m-72=0

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

8m=72

m=72/8

m=9

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