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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-x-(5/x)+8/x-8+8 = 0
x-x-5*x^-1+8/x-8+8 = 0
3*x^-1 = 0 // : 3
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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