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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(y-1)/y = 10 // - 10
(y-1)/y-10 = 0
(y-1)/y+(-10*y)/y = 0
y-10*y-1 = 0
-9*y-1 = 0
(-9*y-1)/y = 0
(-9*y-1)/y = 0 // * y
-9*y-1 = 0
-9*y-1 = 0 // + 1
-9*y = 1 // : -9
y = 1/(-9)
y = -1/9
y = -1/9
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