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k in (-oo:+oo)
6*k = 1/7 // - 1/7
6*k-(1/7) = 0
6*k-1/7 = 0
6*k-1/7 = 0 // + 1/7
6*k = 1/7 // : 6
k = 1/7/6
k = 1/42
k = 1/42
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