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