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h in (-oo:+oo)
(1/2)*h*(8-(6*h)) = 0
(1/2)*h*(8-6*h) = 0
1/2*h*(8-6*h) = 0
( 1/2*h )
1/2*h = 0 // : 1/2
h = 0
( 8-6*h )
8-6*h = 0 // - 8
-6*h = -8 // : -6
h = -8/(-6)
h = 4/3
h in { 0, 4/3 }
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