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y in (-oo:+oo)
y = (90-((90-y)/2))/2 // - (90-((90-y)/2))/2
y-((90-((90-y)/2))/2) = 0
(-1*((-1*(90-y))/2+90))/2+y = 0
(-1*((-1*(90-y))/2+90))/2+(2*y)/2 = 0
2*y-1*((-1*(90-y))/2+90) = 0
3/2*y-45 = 0
(3/2*y-45)/2 = 0
(3/2*y-45)/2 = 0 // * 2
3/2*y-45 = 0
3/2*y-45 = 0 // + 45
3/2*y = 45 // : 3/2
y = 45/3/2
y = 30
y = 30
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