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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x = 17/4 // - 17/4
3/x-(17/4) = 0
3/x-17/4 = 0
3*x^-1 = 17/4 // : 3
x^-1 = 17/12
-1 < 0
1/(x^1) = 17/12 // * x^1
1 = 17/12*x^1 // : 17/12
12/17 = x^1
x = 12/17
x = 12/17
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