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h in (-oo:+oo)
((1/4)*h*(5-(2*h)))/2 = 0
((1/4)*h*(5-2*h))/2 = 0
(1/4*h*(5-2*h))/2 = 0
( 1/4*h )
1/4*h = 0 // : 1/4
h = 0
( 5-2*h )
5-2*h = 0 // - 5
-2*h = -5 // : -2
h = -5/(-2)
h = 5/2
h in { 0, 5/2 }
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