84=5b+2b

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Solution for 84=5b+2b equation: 



84=5b+2b

We move all terms to the left:

84-(5b+2b)=0

We add all the numbers together, and all the variables

-(+7b)+84=0

We get rid of parentheses

-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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