b=8b-84

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Solution for b=8b-84 equation: 



b=8b-84

We move all terms to the left:

b-(8b-84)=0

We get rid of parentheses

b-8b+84=0

We add all the numbers together, and all the variables

-7b+84=0

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

-7b=-84

b=-84/-7

b=+12

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