X/-4=21

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Solution for X/-4=21 equation: 


X in (-oo:+oo)

X/(-4) = 21 // - 21

X/(-4)-21 = 0

-1/4*X-21 = 0 // + 21

-1/4*X = 21 // : -1/4

X = 21/(-1/4)

X = -84

X = -84

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