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