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