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D( y )
9*y^14 = 0
9*y^14 = 0
9*y^14 = 0
9*y^14 = 0 // : 9
y^14 = 0
y = 0
y in (-oo:0) U (0:+oo)
(16*y^8)/(9*y^14) = 0
16/9*y^-6 = 0 // : 16/9
y^-6 = 0
y naleu017Cy do O
y belongs to the empty set
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