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h in (-oo:+oo)
((1/2)*h+h)/2 = 64 // - 64
((1/2)*h+h)/2-64 = 0
(3/2*h)/2-64 = 0
(3/2*h)/2+(-64*2)/2 = 0
(3*h)/2-64*2 = 0
3/2*h-128 = 0
(3/2*h-128)/2 = 0
(3/2*h-128)/2 = 0 // * 2
3/2*h-128 = 0
3/2*h-128 = 0 // + 128
3/2*h = 128 // : 3/2
h = 128/3/2
h = 256/3
h = 256/3
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