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D( y )
-7*y^-11 = 0
y = 0
-7*y^-11 = 0
-7*y^-11 = 0
-7*y^-11 = 0 // : -7
y^-11 = 0
y należy do O
y = 0
y = 0
y in (-oo:0) U (0:+oo)
1/(-7*y^-11) = 0
-1/7*y^11 = 0 // : -1/7
y^11 = 0
y = 0
y in { 0}
y belongs to the empty set
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