-6b-9b=90

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Solution for -6b-9b=90 equation: 



-6b-9b=90

We move all terms to the left:

-6b-9b-(90)=0

We add all the numbers together, and all the variables

-15b-90=0

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

-15b=90

b=90/-15

b=-6

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