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D( y )
y-5 = 0
y-5 = 0
y-5 = 0
y-5 = 0 // + 5
y = 5
y in (-oo:5) U (5:+oo)
3/(y-5) = 2 // - 2
3/(y-5)-2 = 0
3/(y-5)+(-2*(y-5))/(y-5) = 0
3-2*(y-5) = 0
13-2*y = 0
(13-2*y)/(y-5) = 0
(13-2*y)/(y-5) = 0 // * y-5
13-2*y = 0
13-2*y = 0 // - 13
-2*y = -13 // : -2
y = -13/(-2)
y = 13/2
y = 13/2
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