X=5/-21 - solution

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Solution for X=5/-21 equation:

X in (-oo:+oo)

X = 5/(-21) // - 5/(-21)

X-(5/(-21)) = 0

X+5/21 = 0

X+5/21 = 0 // - 5/21

X = -5/21

X = -5/21

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