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D( t )
20*t+10 = 0
20*t+10 = 0
20*t+10 = 0
20*t+10 = 0 // - 10
20*t = -10 // : 20
t = -10/20
t = -1/2
t in (-oo:-1/2) U (-1/2:+oo)
(20*t^3+45*t)/(20*t+10) = 0
20*t^3+45*t = 0
5*t*(4*t^2+9) = 0
4*t^2 = -9 // : 4
t^2 = -9/4
5*t = 0
(5*t)/(20*t+10) = 0
5*t = 0 // : 5
t = 0
t = 0
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