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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
5/y = 8/27 // - 8/27
5/y-(8/27) = 0
5/y-8/27 = 0
5*y^-1 = 8/27 // : 5
y^-1 = 8/135
-1 < 0
1/(y^1) = 8/135 // * y^1
1 = 8/135*y^1 // : 8/135
135/8 = y^1
y = 135/8
y = 135/8
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