b-2b=9

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Solution for b-2b=9 equation: 



b-2b=9

We move all terms to the left:

b-2b-(9)=0

We add all the numbers together, and all the variables

-1b-9=0

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

-b=9

b=9/-1

b=-9

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