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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
96.8/t = 12.1/7 // - 12.1/7
96.8/t-(12.1/7) = 0
96.8/t-1.72857143 = 0
96.8*t^-1 = 1.72857143 // : 96.8
t^-1 = 0.01785714
-1 < 0
1/(t^1) = 0.01785714 // * t^1
1 = 0.01785714*t^1 // : 0.01785714
56.00000896 = t^1
t = 56.00000896
t = 56.00000896
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