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D( y )
y-8 = 0
y-8 = 0
y-8 = 0
y-8 = 0 // + 8
y = 8
y in (-oo:8) U (8:+oo)
(2*y)/(y-8)+2 = (8*y)/(y-8) // - (8*y)/(y-8)
(2*y)/(y-8)-((8*y)/(y-8))+2 = 0
(2*y)/(y-8)-8*y*(y-8)^-1+2 = 0
(2*y)/(y-8)+(-8*y)/(y-8)+2 = 0
(2*y)/(y-8)+(-8*y)/(y-8)+(2*(y-8))/(y-8) = 0
2*(y-8)+2*y-8*y = 0
2*y-6*y-16 = 0
-4*y-16 = 0
(-4*y-16)/(y-8) = 0
(-4*y-16)/(y-8) = 0 // * y-8
-4*y-16 = 0
-4*y-16 = 0 // + 16
-4*y = 16 // : -4
y = 16/(-4)
y = -4
y = -4
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