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D( y )
9*y-5 = 0
4*y = 0
9*y-5 = 0
9*y-5 = 0
9*y-5 = 0 // + 5
9*y = 5 // : 9
y = 5/9
4*y = 0
4*y = 0
4*y = 0 // : 4
y = 0
y in (-oo:0) U (0:5/9) U (5/9:+oo)
8/(9*y-5) = 3/(4*y) // - 3/(4*y)
8/(9*y-5)-(3/(4*y)) = 0
8/(9*y-5)+(-3/4)*y^-1 = 0
8/(9*y-5)-3/(4*y) = 0
(4*8*y)/(4*y*(9*y-5))+(-3*(9*y-5))/(4*y*(9*y-5)) = 0
4*8*y-3*(9*y-5) = 0
5*y+15 = 0
(5*y+15)/(4*y*(9*y-5)) = 0
(5*y+15)/(4*y*(9*y-5)) = 0 // * 4*y*(9*y-5)
5*y+15 = 0
5*y+15 = 0 // - 15
5*y = -15 // : 5
y = -15/5
y = -3
y = -3
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