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D( x )
x-6 = 0
y-6 = 0
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
y-6 = 0
y-6 = 0
y-6 = 0
x naleu017Cy do R
x belongs to the empty set
(x^2)/(y-6) = 36/(x-6)
x belongs to the empty set
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