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k in (-oo:+oo)
6*k = 1/3 // - 1/3
6*k-(1/3) = 0
6*k-1/3 = 0
6*k-1/3 = 0 // + 1/3
6*k = 1/3 // : 6
k = 1/3/6
k = 1/18
k = 1/18
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