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