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T in (-oo:+oo)
T/12 > 3 // - 3
T/12-3 > 0
1/12*T-3 > 0 // + 3
1/12*T > 3 // : 1/12
T > 3/1/12
T > 36
T in (36:+oo)
(36:+oo)
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