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h in (-oo:+oo)
(1/3)*(9*h*h-(6*h)) = 0
(1/3)*(9*h*h-6*h) = 0
1/3*(9*h^2-6*h) = 0
9*h^2-6*h = 0
3*h*(3*h-2) = 0
3*h-2 = 0 // + 2
3*h = 2 // : 3
h = 2/3
3*h*(h-2/3) = 0
1/3*3*h*(h-2/3) = 0
( 1/3 )
1/3 = 0
h belongs to the empty set
( 3*h )
3*h = 0 // : 3
h = 0
( h-2/3 )
h-2/3 = 0 // + 2/3
h = 2/3
h in { 0, 2/3 }
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