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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
13/7 = 65/t // - 65/t
13/7-(65/t) = 0
13/7-65*t^-1 = 0
-65*t^-1 = -13/7 // : -65
t^-1 = 1/35
-1 < 0
1/(t^1) = 1/35 // * t^1
1 = 1/35*t^1 // : 1/35
35 = t^1
t = 35
t = 35
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