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