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(90-((90-y)/2))/2 = 0
((-1*(90-y))/2+90)/2 = 0
(-1*(90-y))/2+90 = 0
(-1*(90-y))/2+(2*90)/2 = 0
2*90-1*(90-y) = 0
y+90 = 0
(y+90)/2 = 0
(y+90)/2 = 0 // * 2
y+90 = 0
(y+90)/2 = 0
y+90 = 0 // - 90
y = -90
y = -90
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