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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
((-8*y^-9)^1)/3 = 0
(-8*y^-9)/3 = 0
-8/3*y^-9 = 0 // : -8/3
y^-9 = 0
y naleu017Cy do O
y belongs to the empty set
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