-21=-10+b

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Solution for -21=-10+b equation: 



-21=-10+b

We move all terms to the left:

-21-(-10+b)=0

We add all the numbers together, and all the variables

-(b-10)-21=0

We get rid of parentheses

-b+10-21=0

We add all the numbers together, and all the variables

-1b-11=0

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

-b=11

b=11/-1

b=-11

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