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u in (-oo:+oo)
2.33 = (410-u)/3 // - (410-u)/3
2.33-((410-u)/3) = 0
(-1*(410-u))/3+2.33 = 0
(-1*(410-u))/3+(2.33*3)/3 = 0
2.33*3-1*(410-u) = 0
u-403.01 = 0
(u-403.01)/3 = 0
(u-403.01)/3 = 0 // * 3
u-403.01 = 0
u-403.01 = 0 // + 403.01
u = 403.01
u = 403.01
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