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D( y )
y = 0
y-2 = 0
y = 0
y = 0
y-2 = 0
y-2 = 0
y-2 = 0 // + 2
y = 2
y in (-oo:0) U (0:2) U (2:+oo)
15/y = 12/(y-2) // - 12/(y-2)
15/y-(12/(y-2)) = 0
15/y-12*(y-2)^-1 = 0
15/y-12/(y-2) = 0
(-12*y)/(y*(y-2))+(15*(y-2))/(y*(y-2)) = 0
15*(y-2)-12*y = 0
3*y-30 = 0
(3*y-30)/(y*(y-2)) = 0
(3*y-30)/(y*(y-2)) = 0 // * y*(y-2)
3*y-30 = 0
3*y-30 = 0 // + 30
3*y = 30 // : 3
y = 30/3
y = 10
y = 10
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