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D( t )
5*t = 0
7*t-35 = 0
5*t = 0
5*t = 0
5*t = 0 // : 5
t = 0
7*t-35 = 0
7*t-35 = 0
7*t-35 = 0 // + 35
7*t = 35 // : 7
t = 35/7
t = 5
t in (-oo:0) U (0:5) U (5:+oo)
((t^2-25)/(5*t))*(35/(7*t-35)) = 0
(35*(t^2-25))/(5*t*(7*t-35)) = 0
1*t^2 = 25 // : 1
t^2 = 25
t^2 = 25 // ^ 1/2
abs(t) = 5
t = 5 or t = -5
t in { 5}
t = -5
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