21=b+8

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Solution for 21=b+8 equation: 



21=b+8

We move all terms to the left:

21-(b+8)=0

We get rid of parentheses

-b-8+21=0

We add all the numbers together, and all the variables

-1b+13=0

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

-b=-13

b=-13/-1

b=+13

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