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