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D( t )
3*t-3 = 0
9*t+3 = 0
3*t-3 = 0
3*t-3 = 0
3*t-3 = 0 // + 3
3*t = 3 // : 3
t = 3/3
t = 1
9*t+3 = 0
9*t+3 = 0
9*t+3 = 0 // - 3
9*t = -3 // : 9
t = -3/9
t = -1/3
t in (-oo:-1/3) U (-1/3:1) U (1:+oo)
(3*t)/(3*t-3)-(1/(9*t+3)) = 1 // - 1
(3*t)/(3*t-3)-(1/(9*t+3))-1 = 0
(3*t)/(3*t-3)-(9*t+3)^-1-1 = 0
(3*t)/(3*t-3)-1/(9*t+3)-1 = 0
(3*t*(9*t+3))/((3*t-3)*(9*t+3))+(-1*(3*t-3))/((3*t-3)*(9*t+3))+(-1*(3*t-3)*(9*t+3))/((3*t-3)*(9*t+3)) = 0
3*t*(9*t+3)-1*(3*t-3)-1*(3*t-3)*(9*t+3) = 0
27*t^2-27*t^2+6*t+18*t+3+9 = 0
24*t+12 = 0
(24*t+12)/((3*t-3)*(9*t+3)) = 0
(24*t+12)/((3*t-3)*(9*t+3)) = 0 // * (3*t-3)*(9*t+3)
24*t+12 = 0
24*t+12 = 0 // - 12
24*t = -12 // : 24
t = -12/24
t = -1/2
t = -1/2
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