21=-3(6+b)

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Solution for 21=-3(6+b) equation: 



21=-3(6+b)

We move all terms to the left:

21-(-3(6+b))=0

We add all the numbers together, and all the variables

-(-3(b+6))+21=0



We calculate terms in parentheses: -(-3(b+6)), so:

-3(b+6)

We multiply parentheses

-3b-18

Back to the equation:

-(-3b-18)



We get rid of parentheses

3b+18+21=0

We add all the numbers together, and all the variables

3b+39=0

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

3b=-39

b=-39/3

b=-13

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