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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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