21=7(b-8)

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Solution for 21=7(b-8) equation: 



21=7(b-8)

We move all terms to the left:

21-(7(b-8))=0



We calculate terms in parentheses: -(7(b-8)), so:

7(b-8)

We multiply parentheses

7b-56

Back to the equation:

-(7b-56)



We get rid of parentheses

-7b+56+21=0

We add all the numbers together, and all the variables

-7b+77=0

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

-7b=-77

b=-77/-7

b=+11

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