-21=63+6b

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Solution for -21=63+6b equation: 



-21=63+6b

We move all terms to the left:

-21-(63+6b)=0

We add all the numbers together, and all the variables

-(6b+63)-21=0

We get rid of parentheses

-6b-63-21=0

We add all the numbers together, and all the variables

-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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