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