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-1=21+b

We move all terms to the left:

-1-(21+b)=0

We add all the numbers together, and all the variables

-(b+21)-1=0

We get rid of parentheses

-b-21-1=0

We add all the numbers together, and all the variables

-1b-22=0

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

-b=22

b=22/-1

b=-22

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