BC=2x-21

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Solution for BC=2x-21 equation: 



=2B-21

We move all terms to the left:

-(2B-21)=0

We get rid of parentheses

-2B+21=0

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

-2B=-21

B=-21/-2

B=10+1/2

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