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D( t )
t < 0
t < 0
t in <0:+oo)
t^5.8 = 3/20 // - 3/20
t^5.8-(3/20) = 0
t^5.8-3/20 = 0
1*t^5.8 = 3/20 // : 1
t^5.8 = 3/20
t^5 = (3/20)^(1/0.8) // ^ 1/5
t = (3/20)^0.25
t = (3/20)^0.25
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