-87=3+9b

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Solution for -87=3+9b equation: 



-87=3+9b

We move all terms to the left:

-87-(3+9b)=0

We add all the numbers together, and all the variables

-(9b+3)-87=0

We get rid of parentheses

-9b-3-87=0

We add all the numbers together, and all the variables

-9b-90=0

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

-9b=90

b=90/-9

b=-10

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