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D( y )
y^3*((16*y^7)/8) = 0
y^3*((16*y^7)/8) = 0
y^3*((16*y^7)/8) = 0
2*y^10 = 0 // : 2
y^10 = 0
y = 0
y in (-oo:0) U (0:+oo)
(y^3*((16*y^7)/8))^-2 = 0
1/4*y^-20 = 0 // : 1/4
y^-20 = 0
y naleu017Cy do O
y belongs to the empty set
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