-4(-10b-9)=9(9+5b)

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Solution for -4(-10b-9)=9(9+5b) equation: 



-4(-10b-9)=9(9+5b)

We move all terms to the left:

-4(-10b-9)-(9(9+5b))=0

We add all the numbers together, and all the variables

-4(-10b-9)-(9(5b+9))=0

We multiply parentheses

40b-(9(5b+9))+36=0



We calculate terms in parentheses: -(9(5b+9)), so:

9(5b+9)

We multiply parentheses

45b+81

Back to the equation:

-(45b+81)



We get rid of parentheses

40b-45b-81+36=0

We add all the numbers together, and all the variables

-5b-45=0

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

-5b=45

b=45/-5

b=-9

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