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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
1.7 = 27.8-(23.6/t) // - 27.8-(23.6/t)
23.6/t-27.8+1.7 = 0
23.6*t^-1 = 26.1 // : 23.6
t^-1 = 1.1059322
-1 < 0
1/(t^1) = 1.1059322 // * t^1
1 = 1.1059322*t^1 // : 1.1059322
0.90421456 = t^1
t = 0.90421456
t = 0.90421456
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