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