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D( t )
3*t-5 = 0
5*t-7 = 0
3*t-5 = 0
3*t-5 = 0
3*t-5 = 0 // + 5
3*t = 5 // : 3
t = 5/3
5*t-7 = 0
5*t-7 = 0
5*t-7 = 0 // + 7
5*t = 7 // : 5
t = 7/5
t in (-oo:7/5) U (7/5:5/3) U (5/3:+oo)
3/(5*t-7) = -5/(3*t-5) // + -5/(3*t-5)
3/(5*t-7)-(-5/(3*t-5)) = 0
3/(5*t-7)+5*(3*t-5)^-1 = 0
3/(5*t-7)+5/(3*t-5) = 0
(3*(3*t-5))/((5*t-7)*(3*t-5))+(5*(5*t-7))/((5*t-7)*(3*t-5)) = 0
3*(3*t-5)+5*(5*t-7) = 0
34*t-50 = 0
(34*t-50)/((5*t-7)*(3*t-5)) = 0
(34*t-50)/((5*t-7)*(3*t-5)) = 0 // * (5*t-7)*(3*t-5)
34*t-50 = 0
34*t-50 = 0 // + 50
34*t = 50 // : 34
t = 50/34
t = 25/17
t = 25/17
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