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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11/17 = 8/x // - 8/x
11/17-(8/x) = 0
11/17-8*x^-1 = 0
-8*x^-1 = -11/17 // : -8
x^-1 = 11/136
-1 < 0
1/(x^1) = 11/136 // * x^1
1 = 11/136*x^1 // : 11/136
136/11 = x^1
x = 136/11
x = 136/11
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