21=3(b+2)

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Solution for 21=3(b+2) equation: 



21=3(b+2)

We move all terms to the left:

21-(3(b+2))=0



We calculate terms in parentheses: -(3(b+2)), so:

3(b+2)

We multiply parentheses

3b+6

Back to the equation:

-(3b+6)



We get rid of parentheses

-3b-6+21=0

We add all the numbers together, and all the variables

-3b+15=0

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

-3b=-15

b=-15/-3

b=+5

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