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D( t )
9*t-5 = 0
3*t-7 = 0
9*t-5 = 0
9*t-5 = 0
9*t-5 = 0 // + 5
9*t = 5 // : 9
t = 5/9
3*t-7 = 0
3*t-7 = 0
3*t-7 = 0 // + 7
3*t = 7 // : 3
t = 7/3
t in (-oo:5/9) U (5/9:7/3) U (7/3:+oo)
(6*t+5)/(9*t-5) = (2*t+3)/(3*t-7) // - (2*t+3)/(3*t-7)
(6*t+5)/(9*t-5)-((2*t+3)/(3*t-7)) = 0
(6*t+5)/(9*t-5)+(-1*(2*t+3))/(3*t-7) = 0
((6*t+5)*(3*t-7))/((9*t-5)*(3*t-7))+(-1*(2*t+3)*(9*t-5))/((9*t-5)*(3*t-7)) = 0
(6*t+5)*(3*t-7)-1*(2*t+3)*(9*t-5) = 0
-44*t-20 = 0
(-44*t-20)/((9*t-5)*(3*t-7)) = 0
(-44*t-20)/((9*t-5)*(3*t-7)) = 0 // * (9*t-5)*(3*t-7)
-44*t-20 = 0
-44*t-20 = 0 // + 20
-44*t = 20 // : -44
t = 20/(-44)
t = -5/11
t = -5/11
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