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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
10/3 = 9/y // - 9/y
10/3-(9/y) = 0
10/3-9*y^-1 = 0
-9*y^-1 = -10/3 // : -9
y^-1 = 10/27
-1 < 0
1/(y^1) = 10/27 // * y^1
1 = 10/27*y^1 // : 10/27
27/10 = y^1
y = 27/10
y = 27/10
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