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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/11 = 17/x // - 17/x
2/11-(17/x) = 0
2/11-17*x^-1 = 0
-17*x^-1 = -2/11 // : -17
x^-1 = 2/187
-1 < 0
1/(x^1) = 2/187 // * x^1
1 = 2/187*x^1 // : 2/187
187/2 = x^1
x = 187/2
x = 187/2
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