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X in (-oo:+oo)
X/2 = 12/(-3) // - 12/(-3)
X/2-(12/(-3)) = 0
X/2+4 = 0
1/2*X+4 = 0 // - 4
1/2*X = -4 // : 1/2
X = -4/1/2
X = -8
X = -8
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