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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
20/12 = 70/t // - 70/t
20/12-(70/t) = 0
20/12-70*t^-1 = 0
-70*t^-1 = -5/3 // : -70
t^-1 = 1/42
-1 < 0
1/(t^1) = 1/42 // * t^1
1 = 1/42*t^1 // : 1/42
42 = t^1
t = 42
t = 42
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