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D( y )
2*y-5 = 0
2*y-5 = 0
2*y-5 = 0
2*y-5 = 0 // + 5
2*y = 5 // : 2
y = 5/2
y in (-oo:5/2) U (5/2:+oo)
(y+8)/(2*y-5) = 1 // - 1
(y+8)/(2*y-5)-1 = 0
(y+8)/(2*y-5)+(-1*(2*y-5))/(2*y-5) = 0
y-1*(2*y-5)+8 = 0
13-y = 0
(13-y)/(2*y-5) = 0
(13-y)/(2*y-5) = 0 // * 2*y-5
13-y = 0
13-y = 0 // - 13
-y = -13 // * -1
y = 13
y = 13
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