-20=b-21

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Solution for -20=b-21 equation: 



-20=b-21

We move all terms to the left:

-20-(b-21)=0

We get rid of parentheses

-b+21-20=0

We add all the numbers together, and all the variables

-1b+1=0

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

-b=-1

b=-1/-1

b=1

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