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D( y )
9*y+3 = 0
9*y+3 = 0
9*y+3 = 0
9*y+3 = 0 // - 3
9*y = -3 // : 9
y = -3/9
y = -1/3
y in (-oo:-1/3) U (-1/3:+oo)
(7*y+5)/(9*y+3) = 0
7*y+5 = 0 // - 5
7*y = -5 // : 7
y = -5/7
y = -5/7
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