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D( y )
7*y-3 = 0
7*y-3 = 0
7*y-3 = 0
7*y-3 = 0 // + 3
7*y = 3 // : 7
y = 3/7
y in (-oo:3/7) U (3/7:+oo)
(5*y)/(7*y-3) = 0
5*y = 0 // : 5
y = 0
y = 0
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