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X in (-oo:+oo)
X/(-3) < 7 // - 7
X/(-3)-7 < 0
-1/3*X-7 < 0 // + 7
-1/3*X < 7 // : -1/3
X > 7/(-1/3)
X > -21
X in (-21:+oo)
(-21:+oo)
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