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