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D( x )
8*x^2 = 0
8*X^2 = 0
8*x^2 = 0
8*x^2 = 0
8*x^2 = 0 // : 8
x^2 = 0
x = 0
8*X^2 = 0
8*X^2 = 0
8*X^2 = 0
x naleu017Cy do R
x belongs to the empty set
9/(8*x^2)-(17/(8*X^2)) = 0
x belongs to the empty set
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