-21-3b=63

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Solution for -21-3b=63 equation: 



-21-3b=63

We move all terms to the left:

-21-3b-(63)=0

We add all the numbers together, and all the variables

-3b-84=0

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

-3b=84

b=84/-3

b=-28

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