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D( t )
t < 0
t < 0
t in <0:+oo)
18*t^(5/4)-((13/4)*t^(9/4)) = 0
(-13/4)*t^(9/4)+18*t^(5/4) = 0
18*t^(5/4)-13/4*t^(9/4) = 0
t^(5/4)*(18-13/4*t) = 0
18-13/4*t = 0 // - 18
-13/4*t = -18 // : -13/4
t = -18/(-13/4)
t = 72/13
t^(5/4) = 0
1*t^(5/4) = 0 // : 1
t^(5/4) = 0
t = 0
t in { 72/13, 0 }
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