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a in (-oo:+oo)
(a-4)/5 = 12 // - 12
(a-4)/5-12 = 0
(a-4)/5+(-12*5)/5 = 0
a-12*5-4 = 0
a-64 = 0
(a-64)/5 = 0
(a-64)/5 = 0 // * 5
a-64 = 0
a-64 = 0 // + 64
a = 64
a = 64
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