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