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D( y )
y^7 = 0
y^7 = 0
y^7 = 0
1*y^7 = 0 // : 1
y^7 = 0
y = 0
y in (-oo:0) U (0:+oo)
(y^5)/(y^7) = 0
1*y^-2 = 0 // : 1
y^-2 = 0
y naleu017Cy do O
y belongs to the empty set
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