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T in (-oo:+oo)
T/(-9) > 3 // - 3
T/(-9)-3 > 0
-1/9*T-3 > 0 // + 3
-1/9*T > 3 // : -1/9
T < 3/(-1/9)
T < -27
T in (-oo:-27)
(-oo:-27)
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