-18=2m+7m

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Solution for -18=2m+7m equation: 



-18=2m+7m

We move all terms to the left:

-18-(2m+7m)=0

We add all the numbers together, and all the variables

-(+9m)-18=0

We get rid of parentheses

-9m-18=0

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

-9m=18

m=18/-9

m=-2

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