21=b*8

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Solution for 21=b*8 equation: 



21=b*8

We move all terms to the left:

21-(b*8)=0

We add all the numbers together, and all the variables

-(+b*8)+21=0

We get rid of parentheses

-b*8+21=0

Wy multiply elements

-8b+21=0

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

-8b=-21

b=-21/-8

b=2+5/8

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