9b+21=81

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Solution for 9b+21=81 equation: 



9b+21=81

We move all terms to the left:

9b+21-(81)=0

We add all the numbers together, and all the variables

9b-60=0

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

9b=60

b=60/9

b=6+2/3

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