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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
8/14 = 36/t // - 36/t
8/14-(36/t) = 0
8/14-36*t^-1 = 0
-36*t^-1 = -4/7 // : -36
t^-1 = 1/63
-1 < 0
1/(t^1) = 1/63 // * t^1
1 = 1/63*t^1 // : 1/63
63 = t^1
t = 63
t = 63
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