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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
20/18 = 50/t // - 50/t
20/18-(50/t) = 0
20/18-50*t^-1 = 0
-50*t^-1 = -10/9 // : -50
t^-1 = 1/45
-1 < 0
1/(t^1) = 1/45 // * t^1
1 = 1/45*t^1 // : 1/45
45 = t^1
t = 45
t = 45
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