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a in (-oo:+oo)
(a-5)/8 = 5 // - 5
(a-5)/8-5 = 0
(a-5)/8+(-5*8)/8 = 0
a-5*8-5 = 0
a-45 = 0
(a-45)/8 = 0
(a-45)/8 = 0 // * 8
a-45 = 0
a-45 = 0 // + 45
a = 45
a = 45
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