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k in (-oo:+oo)
8*k = 12/3 // - 12/3
8*k-(12/3) = 0
8*k-4 = 0
8*k-4 = 0 // + 4
8*k = 4 // : 8
k = 4/8
k = 1/2
k = 1/2
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