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D( t )
9*t-4 = 0
3*t-4 = 0
9*t-4 = 0
9*t-4 = 0
9*t-4 = 0 // + 4
9*t = 4 // : 9
t = 4/9
3*t-4 = 0
3*t-4 = 0
3*t-4 = 0 // + 4
3*t = 4 // : 3
t = 4/3
t in (-oo:4/9) U (4/9:4/3) U (4/3:+oo)
(6*t+5)/(9*t-4) = (2*t+5)/(3*t-4) // - (2*t+5)/(3*t-4)
(6*t+5)/(9*t-4)-((2*t+5)/(3*t-4)) = 0
(6*t+5)/(9*t-4)+(-1*(2*t+5))/(3*t-4) = 0
((6*t+5)*(3*t-4))/((9*t-4)*(3*t-4))+(-1*(2*t+5)*(9*t-4))/((9*t-4)*(3*t-4)) = 0
(6*t+5)*(3*t-4)-1*(2*t+5)*(9*t-4) = 0
-46*t = 0
(-46*t)/((9*t-4)*(3*t-4)) = 0
(-46*t)/((9*t-4)*(3*t-4)) = 0 // * (9*t-4)*(3*t-4)
-46*t = 0
-46*t = 0 // : -46
t = 0
t = 0
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