-9(-4-b)=3(b+20)

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Solution for -9(-4-b)=3(b+20) equation: 



-9(-4-b)=3(b+20)

We move all terms to the left:

-9(-4-b)-(3(b+20))=0

We add all the numbers together, and all the variables

-9(-1b-4)-(3(b+20))=0

We multiply parentheses

9b-(3(b+20))+36=0



We calculate terms in parentheses: -(3(b+20)), so:

3(b+20)

We multiply parentheses

3b+60

Back to the equation:

-(3b+60)



We get rid of parentheses

9b-3b-60+36=0

We add all the numbers together, and all the variables

6b-24=0

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

6b=24

b=24/6

b=4

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