k/-421

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Solution for k/-421 equation: 


k in (-oo:+oo)

k/(-4) < 21 // - 21

k/(-4)-21 < 0

-1/4*k-21 < 0 // + 21

-1/4*k < 21 // : -1/4

k > 21/(-1/4)

k > -84

k in (-84:+oo)

(-84:+oo)

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