3b-9=21b=9

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Solution for 3b-9=21b=9 equation: 



3b-9=21b=9

We move all terms to the left:

3b-9-(21b)=0

We add all the numbers together, and all the variables

-18b-9=0

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

-18b=9

b=9/-18

b=-1/2

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