8-BxC=21

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Solution for 8-BxC=21 equation: 



8-B=21

We move all terms to the left:

8-B-(21)=0

We add all the numbers together, and all the variables

-1B-13=0

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

-B=13

B=13/-1

B=-13

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