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u in (-oo:+oo)
(u+12)/4 = 5 // - 5
(u+12)/4-5 = 0
(u+12)/4+(-5*4)/4 = 0
u-5*4+12 = 0
u-8 = 0
(u-8)/4 = 0
(u-8)/4 = 0 // * 4
u-8 = 0
u-8 = 0 // + 8
u = 8
u = 8
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