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