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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
(t^-1)/2 = 7 // - 7
(t^-1)/2-7 = 0
1/2*t^-1 = 7 // : 1/2
t^-1 = 14
-1 < 0
1/(t^1) = 14 // * t^1
1 = 14*t^1 // : 14
1/14 = t^1
t = 1/14
t = 1/14
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