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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
7/t = 6/7 // - 6/7
7/t-(6/7) = 0
7/t-6/7 = 0
7*t^-1 = 6/7 // : 7
t^-1 = 6/49
-1 < 0
1/(t^1) = 6/49 // * t^1
1 = 6/49*t^1 // : 6/49
49/6 = t^1
t = 49/6
t = 49/6
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