84=9b-3b

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Solution for 84=9b-3b equation: 



84=9b-3b

We move all terms to the left:

84-(9b-3b)=0

We add all the numbers together, and all the variables

-(+6b)+84=0

We get rid of parentheses

-6b+84=0

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

-6b=-84

b=-84/-6

b=+14

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