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k in (-oo:+oo)
k/6 = 4/2 // - 4/2
k/6-(4/2) = 0
k/6-2 = 0
1/6*k-2 = 0 // + 2
1/6*k = 2 // : 1/6
k = 2/1/6
k = 12
k = 12
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