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q in (-oo:+oo)
q = (120-((120-q)/2))/2 // - (120-((120-q)/2))/2
q-((120-((120-q)/2))/2) = 0
(-1*((-1*(120-q))/2+120))/2+q = 0
(-1*((-1*(120-q))/2+120))/2+(2*q)/2 = 0
2*q-1*((-1*(120-q))/2+120) = 0
3/2*q-60 = 0
(3/2*q-60)/2 = 0
(3/2*q-60)/2 = 0 // * 2
3/2*q-60 = 0
3/2*q-60 = 0 // + 60
3/2*q = 60 // : 3/2
q = 60/3/2
q = 40
q = 40
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