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D( t )
10*t+2 = 0
10*t+2 = 0
10*t+2 = 0
10*t+2 = 0 // - 2
10*t = -2 // : 10
t = -2/10
t = -1/5
t in (-oo:-1/5) U (-1/5:+oo)
(5*t-2)/(10*t+2) = 0
5*t-2 = 0 // + 2
5*t = 2 // : 5
t = 2/5
t = 2/5
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