a/-2=21

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Solution for a/-2=21 equation: 


a in (-oo:+oo)

a/(-2) = 21 // - 21

a/(-2)-21 = 0

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

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

a = 21/(-1/2)

a = -42

a = -42

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