21=7(8+b)

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



21=7(8+b)

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(7(b+8))+21=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-35=0

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

-7b=35

b=35/-7

b=-5

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