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D( x )
y^2 = 0
x^2 = 0
y^2 = 0
y^2 = 0
y^2 = 0
x naleu017Cy do R
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x belongs to the empty set
9/(x^2)-(4/(y^2)) = 36
x belongs to the empty set
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