-620=9b-7(-9b-4)

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Solution for -620=9b-7(-9b-4) equation: 



-620=9b-7(-9b-4)

We move all terms to the left:

-620-(9b-7(-9b-4))=0



We calculate terms in parentheses: -(9b-7(-9b-4)), so:

9b-7(-9b-4)

We multiply parentheses

9b+63b+28

We add all the numbers together, and all the variables

72b+28

Back to the equation:

-(72b+28)



We get rid of parentheses

-72b-28-620=0

We add all the numbers together, and all the variables

-72b-648=0

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

-72b=648

b=648/-72

b=-9

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