72=-4(b-9)-8b

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Solution for 72=-4(b-9)-8b equation: 



72=-4(b-9)-8b

We move all terms to the left:

72-(-4(b-9)-8b)=0



We calculate terms in parentheses: -(-4(b-9)-8b), so:

-4(b-9)-8b

We add all the numbers together, and all the variables

-8b-4(b-9)

We multiply parentheses

-8b-4b+36

We add all the numbers together, and all the variables

-12b+36

Back to the equation:

-(-12b+36)



We get rid of parentheses

12b-36+72=0

We add all the numbers together, and all the variables

12b+36=0

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

12b=-36

b=-36/12

b=-3

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