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h in (-oo:+oo)
((1/2)*h-10)*(15-((1/2)*h)) = 0
((1/2)*h-10)*((-1/2)*h+15) = 0
(1/2*h-10)*(15-1/2*h) = 0
( 1/2*h-10 )
1/2*h-10 = 0 // + 10
1/2*h = 10 // : 1/2
h = 10/1/2
h = 20
( 15-1/2*h )
15-1/2*h = 0 // - 15
-1/2*h = -15 // : -1/2
h = -15/(-1/2)
h = 30
h in { 20, 30 }
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