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t in (-oo:+oo)
-t/3 < 27 // - 27
-t/3-27 < 0
-1/3*t-27 < 0 // + 27
-1/3*t < 27 // : -1/3
t > 27/(-1/3)
t > -81
t in (-81:+oo)
(-81:+oo)
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