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X in (-oo:+oo)
X/(-4) = 6-4 // - 6-4
X/(-4)-6+4 = 0
-1/4*X-2 = 0 // + 2
-1/4*X = 2 // : -1/4
X = 2/(-1/4)
X = -8
X = -8
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