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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/5 = 17/x // - 17/x
6/5-(17/x) = 0
6/5-17*x^-1 = 0
-17*x^-1 = -6/5 // : -17
x^-1 = 6/85
-1 < 0
1/(x^1) = 6/85 // * x^1
1 = 6/85*x^1 // : 6/85
85/6 = x^1
x = 85/6
x = 85/6
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