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