-87=12b-9+2b-b

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Solution for -87=12b-9+2b-b equation: 



-87=12b-9+2b-b

We move all terms to the left:

-87-(12b-9+2b-b)=0

We add all the numbers together, and all the variables

-(13b-9)-87=0

We get rid of parentheses

-13b+9-87=0

We add all the numbers together, and all the variables

-13b-78=0

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

-13b=78

b=78/-13

b=-6

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