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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1/x)/2 = 4 // - 4
(1/x)/2-4 = 0
1/2*x^-1 = 4 // : 1/2
x^-1 = 8
-1 < 0
1/(x^1) = 8 // * x^1
1 = 8*x^1 // : 8
1/8 = x^1
x = 1/8
x = 1/8
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