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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(3/x)-5 = x+5/x+1 // - x+5/x+1
x-x-(3/x)-(5/x)-5-1 = 0
x-x-3*x^-1-5*x^-1-5-1 = 0
-8*x^-1 = 6 // : -8
x^-1 = -3/4
-1 < 0
1/(x^1) = -3/4 // * x^1
1 = -3/4*x^1 // : -3/4
-4/3 = x^1
x = -4/3
x = -4/3
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