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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
5/16 = 15/y // - 15/y
5/16-(15/y) = 0
5/16-15*y^-1 = 0
-15*y^-1 = -5/16 // : -15
y^-1 = 1/48
-1 < 0
1/(y^1) = 1/48 // * y^1
1 = 1/48*y^1 // : 1/48
48 = y^1
y = 48
y = 48
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