B/-2+6=21

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Solution for B/-2+6=21 equation: 


B in (-oo:+oo)

B/(-2)+6 = 21 // - 21

B/(-2)-21+6 = 0

-1/2*B-15 = 0 // + 15

-1/2*B = 15 // : -1/2

B = 15/(-1/2)

B = -30

B = -30

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