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u in (-oo:+oo)
(u+12)/4 = -5 // + 5
(u+12)/4+5 = 0
(u+12)/4+(4*5)/4 = 0
u+4*5+12 = 0
u+32 = 0
(u+32)/4 = 0
(u+32)/4 = 0 // * 4
u+32 = 0
u+32 = 0 // - 32
u = -32
u = -32
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