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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
20/t = 2.5/6 // - 2.5/6
20/t-(2.5/6) = 0
20/t-0.41666667 = 0
20*t^-1 = 0.41666667 // : 20
t^-1 = 0.02083333
-1 < 0
1/(t^1) = 0.02083333 // * t^1
1 = 0.02083333*t^1 // : 0.02083333
48.00000768 = t^1
t = 48.00000768
t = 48.00000768
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