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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
2-(19/t) = -5 // + 5
2-(19/t)+5 = 0
2-19*t^-1+5 = 0
-19*t^-1 = -7 // : -19
t^-1 = 7/19
-1 < 0
1/(t^1) = 7/19 // * t^1
1 = 7/19*t^1 // : 7/19
19/7 = t^1
t = 19/7
t = 19/7
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