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D( T )
T = 0
T = 0
T = 0
T in (-oo:0) U (0:+oo)
5/6 = 2.25/T // - 2.25/T
5/6-(2.25/T) = 0
5/6-2.25*T^-1 = 0
-2.25*T^-1 = -5/6 // : -2.25
T^-1 = 0.37037037
-1 < 0
1/(T^1) = 0.37037037 // * T^1
1 = 0.37037037*T^1 // : 0.37037037
2.7 = T^1
T = 2.7
T = 2.7
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