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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
17/x = 10/1 // - 10/1
17/x-(10/1) = 0
17/x-10 = 0
17*x^-1 = 10 // : 17
x^-1 = 10/17
-1 < 0
1/(x^1) = 10/17 // * x^1
1 = 10/17*x^1 // : 10/17
17/10 = x^1
x = 17/10
x = 17/10
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