3b-21=3

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Solution for 3b-21=3 equation: 



3b-21=3

We move all terms to the left:

3b-21-(3)=0

We add all the numbers together, and all the variables

3b-24=0

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

3b=24

b=24/3

b=8

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