B2+4b=21

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Solution for B2+4b=21 equation: 



2+4B=21

We move all terms to the left:

2+4B-(21)=0

We add all the numbers together, and all the variables

4B-19=0

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

4B=19

B=19/4

B=4+3/4

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