21-3b=6

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Solution for 21-3b=6 equation: 



21-3b=6

We move all terms to the left:

21-3b-(6)=0

We add all the numbers together, and all the variables

-3b+15=0

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

-3b=-15

b=-15/-3

b=+5

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