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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x-7-5 = 17/x-7 // - 17/x-7
6/x-(17/x)-7-5+7 = 0
6/x-17*x^-1-7-5+7 = 0
-11*x^-1 = 5 // : -11
x^-1 = -5/11
-1 < 0
1/(x^1) = -5/11 // * x^1
1 = -5/11*x^1 // : -5/11
-11/5 = x^1
x = -11/5
x = -11/5
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