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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(5/x)-2 = x+5 // - x+5
x-x-(5/x)-5-2 = 0
x-x-5*x^-1-5-2 = 0
-5*x^-1 = 7 // : -5
x^-1 = -7/5
-1 < 0
1/(x^1) = -7/5 // * x^1
1 = -7/5*x^1 // : -7/5
-5/7 = x^1
x = -5/7
x = -5/7
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