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D( t )
5*t = 0
3*t = 0
t = 0
5*t = 0
5*t = 0
5*t = 0 // : 5
t = 0
3*t = 0
3*t = 0
3*t = 0 // : 3
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
1/t+1/(3*t)+1/(5*t) = 9 // - 9
1/t+1/(3*t)+1/(5*t)-9 = 0
23/15*t^-1 = 9 // : 23/15
t^-1 = 135/23
-1 < 0
1/(t^1) = 135/23 // * t^1
1 = 135/23*t^1 // : 135/23
23/135 = t^1
t = 23/135
t = 23/135
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