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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
11/y = 9/27 // - 9/27
11/y-(9/27) = 0
11/y-1/3 = 0
11*y^-1 = 1/3 // : 11
y^-1 = 1/33
-1 < 0
1/(y^1) = 1/33 // * y^1
1 = 1/33*y^1 // : 1/33
33 = y^1
y = 33
y = 33
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