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y in (-oo:+oo)
(y-12)/8 = 4 // - 4
(y-12)/8-4 = 0
(y-12)/8+(-4*8)/8 = 0
y-4*8-12 = 0
y-44 = 0
(y-44)/8 = 0
(y-44)/8 = 0 // * 8
y-44 = 0
y-44 = 0 // + 44
y = 44
y = 44
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