21b-1=5

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Solution for 21b-1=5 equation: 



21b-1=5

We move all terms to the left:

21b-1-(5)=0

We add all the numbers together, and all the variables

21b-6=0

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

21b=6

b=6/21

b=2/7

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