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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
13/3 = 8/y // - 8/y
13/3-(8/y) = 0
13/3-8*y^-1 = 0
-8*y^-1 = -13/3 // : -8
y^-1 = 13/24
-1 < 0
1/(y^1) = 13/24 // * y^1
1 = 13/24*y^1 // : 13/24
24/13 = y^1
y = 24/13
y = 24/13
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