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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
10/5 = 8/y // - 8/y
10/5-(8/y) = 0
10/5-8*y^-1 = 0
-8*y^-1 = -2 // : -8
y^-1 = 1/4
-1 < 0
1/(y^1) = 1/4 // * y^1
1 = 1/4*y^1 // : 1/4
4 = y^1
y = 4
y = 4
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