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