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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x-(1/8) = 6/x // - 6/x
4/x-(6/x)-(1/8) = 0
4/x-6*x^-1-1/8 = 0
-2*x^-1 = 1/8 // : -2
x^-1 = -1/16
-1 < 0
1/(x^1) = -1/16 // * x^1
1 = -1/16*x^1 // : -1/16
-16 = x^1
x = -16
x = -16
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