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X in (-oo:+oo)
X/(-2)-6 < 4 // - 4
X/(-2)-6-4 < 0
-1/2*X-10 < 0 // + 10
-1/2*X < 10 // : -1/2
X > 10/(-1/2)
X > -20
X in (-20:+oo)
(-20:+oo)
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