87=-3(-4b-5)

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Solution for 87=-3(-4b-5) equation: 



87=-3(-4b-5)

We move all terms to the left:

87-(-3(-4b-5))=0



We calculate terms in parentheses: -(-3(-4b-5)), so:

-3(-4b-5)

We multiply parentheses

12b+15

Back to the equation:

-(12b+15)



We get rid of parentheses

-12b-15+87=0

We add all the numbers together, and all the variables

-12b+72=0

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

-12b=-72

b=-72/-12

b=+6

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