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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
6/y = 5/y-11 // - 5/y-11
6/y-(5/y)+11 = 0
6/y-5*y^-1+11 = 0
1*y^-1 = -11 // : 1
y^-1 = -11
-1 < 0
1/(y^1) = -11 // * y^1
1 = -11*y^1 // : -11
-1/11 = y^1
y = -1/11
y = -1/11
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