-18=3b+6b

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Solution for -18=3b+6b equation: 



-18=3b+6b

We move all terms to the left:

-18-(3b+6b)=0

We add all the numbers together, and all the variables

-(+9b)-18=0

We get rid of parentheses

-9b-18=0

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

-9b=18

b=18/-9

b=-2

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