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D( y )
y-7 = 0
y-7 = 0
y-7 = 0
y-7 = 0 // + 7
y = 7
y in (-oo:7) U (7:+oo)
(((5*y-35)/77)/(y-7))/14 = 0
(5*y-35)/(14*77*(y-7)) = 0
5*y-35 = 0 // + 35
5*y = 35 // : 5
y = 35/5
y = 7
y in { 7}
y belongs to the empty set
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