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D( x )
(y+5)/(y-7) = 0
y-7 = 0
(y+5)/(y-7) = 0
(y+5)/(y-7) = 0
y-7 = 0
y-7 = 0
y-7 = 0
x naleu017Cy do R
x belongs to the empty set
((Y-3)/(y-7))/((y+5)/(y-7)) = 0
x belongs to the empty set
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