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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
5/9 = 25/y // - 25/y
5/9-(25/y) = 0
5/9-25*y^-1 = 0
-25*y^-1 = -5/9 // : -25
y^-1 = 1/45
-1 < 0
1/(y^1) = 1/45 // * y^1
1 = 1/45*y^1 // : 1/45
45 = y^1
y = 45
y = 45
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