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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x-7-3 = 17/x-7 // - 17/x-7
6/x-(17/x)-7-3+7 = 0
6/x-17*x^-1-7-3+7 = 0
-11*x^-1 = 3 // : -11
x^-1 = -3/11
-1 < 0
1/(x^1) = -3/11 // * x^1
1 = -3/11*x^1 // : -3/11
-11/3 = x^1
x = -11/3
x = -11/3
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