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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
4-(3/y)-2 = 5/y-1 // - 5/y-1
1-(3/y)-(5/y)-2+4 = 0
1-3*y^-1-5*y^-1-2+4 = 0
-8*y^-1 = -3 // : -8
y^-1 = 3/8
-1 < 0
1/(y^1) = 3/8 // * y^1
1 = 3/8*y^1 // : 3/8
8/3 = y^1
y = 8/3
y = 8/3
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