84=-7(b-3)

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Solution for 84=-7(b-3) equation: 



84=-7(b-3)

We move all terms to the left:

84-(-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-21+84=0

We add all the numbers together, and all the variables

7b+63=0

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

7b=-63

b=-63/7

b=-9

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