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D( t )
t = 0
t = 0
t = 0
t in (-oo:0) U (0:+oo)
14/6 = 63/t // - 63/t
14/6-(63/t) = 0
14/6-63*t^-1 = 0
-63*t^-1 = -7/3 // : -63
t^-1 = 1/27
-1 < 0
1/(t^1) = 1/27 // * t^1
1 = 1/27*t^1 // : 1/27
27 = t^1
t = 27
t = 27
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