-21=12+b

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Solution for -21=12+b equation: 



-21=12+b

We move all terms to the left:

-21-(12+b)=0

We add all the numbers together, and all the variables

-(b+12)-21=0

We get rid of parentheses

-b-12-21=0

We add all the numbers together, and all the variables

-1b-33=0

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

-b=33

b=33/-1

b=-33

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