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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
12/11 = 5/y // - 5/y
12/11-(5/y) = 0
12/11-5*y^-1 = 0
-5*y^-1 = -12/11 // : -5
y^-1 = 12/55
-1 < 0
1/(y^1) = 12/55 // * y^1
1 = 12/55*y^1 // : 12/55
55/12 = y^1
y = 55/12
y = 55/12
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