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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6-(2/x) = 4/x-1 // - 4/x-1
1-(2/x)-(4/x)+6 = 0
1-2*x^-1-4*x^-1+6 = 0
-6*x^-1 = -7 // : -6
x^-1 = 7/6
-1 < 0
1/(x^1) = 7/6 // * x^1
1 = 7/6*x^1 // : 7/6
6/7 = x^1
x = 6/7
x = 6/7
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