9b-21=60

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Solution for 9b-21=60 equation: 



9b-21=60

We move all terms to the left:

9b-21-(60)=0

We add all the numbers together, and all the variables

9b-81=0

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

9b=81

b=81/9

b=9

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