(-1)*m+81=-9

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Solution for (-1)*m+81=-9 equation: 



(-1)*m+81=-9

We move all terms to the left:

(-1)*m+81-(-9)=0

We add all the numbers together, and all the variables

(-1)*m+90=0

We multiply parentheses

-1m+90=0

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

-m=-90

m=-90/-1

m=+90

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