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D( T )
T = 0
T = 0
T = 0
T in (-oo:0) U (0:+oo)
7 = 3/T-5 // - 3/T-5
5-(3/T)+7 = 0
5-3*T^-1+7 = 0
-3*T^-1 = -12 // : -3
T^-1 = 4
-1 < 0
1/(T^1) = 4 // * T^1
1 = 4*T^1 // : 4
1/4 = T^1
T = 1/4
T = 1/4
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