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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-(6*y)+6/(y^2) = 0
y-6*y+6/(y^2) = 0
6*y^-2-5*y = 0
y*(6*y^-3-5) = 0
6*y^-3 = 5 // : 6
y^-3 = 5/6
-3 < 0
1/(y^3) = 5/6 // * y^3
1 = 5/6*y^3 // : 5/6
6/5 = y^3
y^3 = 6/5 // ^ 1/3
y = (6/5)^(1/3)
y = 0
y = 0
y in { 0}
y = (6/5)^(1/3)
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