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