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