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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
18/7 = 90/t // - 90/t
18/7-(90/t) = 0
18/7-90*t^-1 = 0
-90*t^-1 = -18/7 // : -90
t^-1 = 1/35
-1 < 0
1/(t^1) = 1/35 // * t^1
1 = 1/35*t^1 // : 1/35
35 = t^1
t = 35
t = 35
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