B2-12b+21=4

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Solution for B2-12b+21=4 equation: 



2-12B+21=4

We move all terms to the left:

2-12B+21-(4)=0

We add all the numbers together, and all the variables

-12B+19=0

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

-12B=-19

B=-19/-12

B=1+7/12

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