21-4b=12

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Solution for 21-4b=12 equation: 



21-4b=12

We move all terms to the left:

21-4b-(12)=0

We add all the numbers together, and all the variables

-4b+9=0

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

-4b=-9

b=-9/-4

b=2+1/4

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