21=b+10

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Solution for 21=b+10 equation: 



21=b+10

We move all terms to the left:

21-(b+10)=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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