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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x = 10/17 // - 10/17
2/x-(10/17) = 0
2/x-10/17 = 0
2*x^-1 = 10/17 // : 2
x^-1 = 5/17
-1 < 0
1/(x^1) = 5/17 // * x^1
1 = 5/17*x^1 // : 5/17
17/5 = x^1
x = 17/5
x = 17/5
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