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D( t )
t-1 = 0
9*t-6 = 0
t-1 = 0
t-1 = 0
t-1 = 0 // + 1
t = 1
9*t-6 = 0
9*t-6 = 0
9*t-6 = 0 // + 6
9*t = 6 // : 9
t = 6/9
t = 2/3
t in (-oo:2/3) U (2/3:1) U (1:+oo)
1/(t-1)+t/(9*t-6) = 1/9 // - 1/9
1/(t-1)+t/(9*t-6)-(1/9) = 0
1/(t-1)+t/(9*t-6)-1/9 = 0
(1*9*(9*t-6))/(9*(t-1)*(9*t-6))+(9*t*(t-1))/(9*(t-1)*(9*t-6))+(-1*(t-1)*(9*t-6))/(9*(t-1)*(9*t-6)) = 0
1*9*(9*t-6)+9*t*(t-1)-1*(t-1)*(9*t-6) = 0
9*t^2-9*t^2+72*t+15*t-54-6 = 0
87*t-60 = 0
(87*t-60)/(9*(t-1)*(9*t-6)) = 0
(87*t-60)/(9*(t-1)*(9*t-6)) = 0 // * 9*(t-1)*(9*t-6)
87*t-60 = 0
87*t-60 = 0 // + 60
87*t = 60 // : 87
t = 60/87
t = 20/29
t = 20/29
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