-18=b-7b

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Solution for -18=b-7b equation: 



-18=b-7b

We move all terms to the left:

-18-(b-7b)=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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