-21+7b=7(b-3)

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Solution for -21+7b=7(b-3) equation: 



-21+7b=7(b-3)

We move all terms to the left:

-21+7b-(7(b-3))=0



We calculate terms in parentheses: -(7(b-3)), so:

7(b-3)

We multiply parentheses

7b-21

Back to the equation:

-(7b-21)



We get rid of parentheses

7b-7b+21-21=0

We add all the numbers together, and all the variables

=0

b=0/1

b=0

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