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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
17/34 = 7/t // - 7/t
17/34-(7/t) = 0
17/34-7*t^-1 = 0
-7*t^-1 = -1/2 // : -7
t^-1 = 1/14
-1 < 0
1/(t^1) = 1/14 // * t^1
1 = 1/14*t^1 // : 1/14
14 = t^1
t = 14
t = 14
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