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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
8/16 = 5/y // - 5/y
8/16-(5/y) = 0
8/16-5*y^-1 = 0
-5*y^-1 = -1/2 // : -5
y^-1 = 1/10
-1 < 0
1/(y^1) = 1/10 // * y^1
1 = 1/10*y^1 // : 1/10
10 = y^1
y = 10
y = 10
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