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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x = 17/8 // - 17/8
6/x-(17/8) = 0
6/x-17/8 = 0
6*x^-1 = 17/8 // : 6
x^-1 = 17/48
-1 < 0
1/(x^1) = 17/48 // * x^1
1 = 17/48*x^1 // : 17/48
48/17 = x^1
x = 48/17
x = 48/17
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