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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 6/x // - 6/x
5/x-(6/x) = 0
5/x-6*x^-1 = 0
-1*x^-1 = 0 // : -1
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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