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h in (-oo:+oo)
(6*h^2-(3*h))/2 = 0
(6*h^2-3*h)/2 = 0
6*h^2-3*h = 0
3*h*(2*h-1) = 0
2*h-1 = 0 // + 1
2*h = 1 // : 2
h = 1/2
3*h*(h-1/2) = 0
(3*h*(h-1/2))/2 = 0
( 3*h )
3*h = 0 // : 3
h = 0
( h-1/2 )
h-1/2 = 0 // + 1/2
h = 1/2
h in { 0, 1/2 }
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