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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^2-x^2-(4/x)-2 = 4 // - 4
x^2-x^2-(4/x)-4-2 = 0
x^2-x^2-4*x^-1-4-2 = 0
-4*x^-1 = 6 // : -4
x^-1 = -3/2
-1 < 0
1/(x^1) = -3/2 // * x^1
1 = -3/2*x^1 // : -3/2
-2/3 = x^1
x = -2/3
x = -2/3
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