84=3-9b

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Solution for 84=3-9b equation: 



84=3-9b

We move all terms to the left:

84-(3-9b)=0

We add all the numbers together, and all the variables

-(-9b+3)+84=0

We get rid of parentheses

9b-3+84=0

We add all the numbers together, and all the variables

9b+81=0

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

9b=-81

b=-81/9

b=-9

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