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