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D( T )
T = 0
T = 0
T = 0
T in (-oo:0) U (0:+oo)
4-(29/T) = 0
4-29*T^-1 = 0
-29*T^-1 = -4 // : -29
T^-1 = 4/29
-1 < 0
1/(T^1) = 4/29 // * T^1
1 = 4/29*T^1 // : 4/29
29/4 = T^1
T = 29/4
T = 29/4
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