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y in (-oo:+oo)
y = (120-((120-y)/4))/4 // - (120-((120-y)/4))/4
y-((120-((120-y)/4))/4) = 0
(-1*((-1*(120-y))/4+120))/4+y = 0
(-1*((-1*(120-y))/4+120))/4+(4*y)/4 = 0
4*y-1*((-1*(120-y))/4+120) = 0
15/4*y-90 = 0
(15/4*y-90)/4 = 0
(15/4*y-90)/4 = 0 // * 4
15/4*y-90 = 0
15/4*y-90 = 0 // + 90
15/4*y = 90 // : 15/4
y = 90/15/4
y = 24
y = 24
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