-90=40+10b

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Solution for -90=40+10b equation: 



-90=40+10b

We move all terms to the left:

-90-(40+10b)=0

We add all the numbers together, and all the variables

-(10b+40)-90=0

We get rid of parentheses

-10b-40-90=0

We add all the numbers together, and all the variables

-10b-130=0

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

-10b=130

b=130/-10

b=-13

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