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