21+3b=9

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Solution for 21+3b=9 equation: 



21+3b=9

We move all terms to the left:

21+3b-(9)=0

We add all the numbers together, and all the variables

3b+12=0

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

3b=-12

b=-12/3

b=-4

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