21=8b+8-b

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Solution for 21=8b+8-b equation: 



21=8b+8-b

We move all terms to the left:

21-(8b+8-b)=0

We add all the numbers together, and all the variables

-(7b+8)+21=0

We get rid of parentheses

-7b-8+21=0

We add all the numbers together, and all the variables

-7b+13=0

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

-7b=-13

b=-13/-7

b=1+6/7

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