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D( t )
5*t-12 = 0
t = 0
5*t-12 = 0
5*t-12 = 0
5*t-12 = 0 // + 12
5*t = 12 // : 5
t = 12/5
t = 0
t = 0
t in (-oo:0) U (0:12/5) U (12/5:+oo)
2/t = 1/(5*t-12) // - 1/(5*t-12)
2/t-(1/(5*t-12)) = 0
2/t-(5*t-12)^-1 = 0
2/t-1/(5*t-12) = 0
(-1*t)/(t*(5*t-12))+(2*(5*t-12))/(t*(5*t-12)) = 0
2*(5*t-12)-1*t = 0
9*t-24 = 0
(9*t-24)/(t*(5*t-12)) = 0
(9*t-24)/(t*(5*t-12)) = 0 // * t*(5*t-12)
9*t-24 = 0
9*t-24 = 0 // + 24
9*t = 24 // : 9
t = 24/9
t = 8/3
t = 8/3
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