-9=3m+6=18

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Solution for -9=3m+6=18 equation: 



-9=3m+6=18

We move all terms to the left:

-9-(3m+6)=0

We get rid of parentheses

-3m-6-9=0

We add all the numbers together, and all the variables

-3m-15=0

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

-3m=15

m=15/-3

m=-5

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