3b=21.b=

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Solution for 3b=21.b= equation: 



3b=21.b=

We move all terms to the left:

3b-(21.b)=0

We add all the numbers together, and all the variables

3b-(+21.b)=0

We get rid of parentheses

3b-21.b=0

We add all the numbers together, and all the variables

-18b=0

b=0/-18

b=0

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