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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(6/17)/(x^2)+1 = 0
6/17*x^-2 = -1 // : 6/17
x^-2 = -17/6
-2 < 0
1/(x^2) = -17/6 // * x^2
1 = -17/6*x^2 // : -17/6
-6/17 = x^2
x belongs to the empty set
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