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h in (-oo:+oo)
50*(h/90)*(90-h) = 10*h // - 10*h
50*(h/90)*(90-h)-(10*h) = 0
50*(h/90)*(90-h)-10*h = 0
5/9*h*(90-h)-10*h = 0
5/9*h*(90-h)-10*h = 0
40*h-5/9*h^2 = 0
40*h-5/9*h^2 = 0
5*h*(8-1/9*h) = 0
8-1/9*h = 0 // - 8
-1/9*h = -8 // : -1/9
h = -8/(-1/9)
h = 72
5*h*(h-72) = 0
5*h*(h-72) = 0
( 5*h )
5*h = 0 // : 5
h = 0
( h-72 )
h-72 = 0 // + 72
h = 72
h in { 0, 72 }
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