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