-18=7b-b

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Solution for -18=7b-b equation: 



-18=7b-b

We move all terms to the left:

-18-(7b-b)=0

We add all the numbers together, and all the variables

-(+6b)-18=0

We get rid of parentheses

-6b-18=0

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

-6b=18

b=18/-6

b=-3

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