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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
8/5 = 24/y // - 24/y
8/5-(24/y) = 0
8/5-24*y^-1 = 0
-24*y^-1 = -8/5 // : -24
y^-1 = 1/15
-1 < 0
1/(y^1) = 1/15 // * y^1
1 = 1/15*y^1 // : 1/15
15 = y^1
y = 15
y = 15
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