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