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a in (-oo:+oo)
(a-4)/2 = 12 // - 12
(a-4)/2-12 = 0
(a-4)/2+(-12*2)/2 = 0
a-12*2-4 = 0
a-28 = 0
(a-28)/2 = 0
(a-28)/2 = 0 // * 2
a-28 = 0
a-28 = 0 // + 28
a = 28
a = 28
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