21-3b=12

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Solution for 21-3b=12 equation: 



21-3b=12

We move all terms to the left:

21-3b-(12)=0

We add all the numbers together, and all the variables

-3b+9=0

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

-3b=-9

b=-9/-3

b=+3

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