b/-2=21

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Solution for b/-2=21 equation: 


b in (-oo:+oo)

b/(-2) = 21 // - 21

b/(-2)-21 = 0

-1/2*b-21 = 0 // + 21

-1/2*b = 21 // : -1/2

b = 21/(-1/2)

b = -42

b = -42

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