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