21+7b=3(7-b)

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



21+7b=3(7-b)

We move all terms to the left:

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

We add all the numbers together, and all the variables

7b-(3(-1b+7))+21=0



We calculate terms in parentheses: -(3(-1b+7)), so:

3(-1b+7)

We multiply parentheses

-3b+21

Back to the equation:

-(-3b+21)



We get rid of parentheses

7b+3b-21+21=0

We add all the numbers together, and all the variables

10b=0

b=0/10

b=0

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