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