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