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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/x = 10/17 // - 10/17
9/x-(10/17) = 0
9/x-10/17 = 0
9*x^-1 = 10/17 // : 9
x^-1 = 10/153
-1 < 0
1/(x^1) = 10/153 // * x^1
1 = 10/153*x^1 // : 10/153
153/10 = x^1
x = 153/10
x = 153/10
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