-6=3b+21

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Solution for -6=3b+21 equation: 



-6=3b+21

We move all terms to the left:

-6-(3b+21)=0

We get rid of parentheses

-3b-21-6=0

We add all the numbers together, and all the variables

-3b-27=0

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

-3b=27

b=27/-3

b=-9

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