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k in (-oo:+oo)
(-1/7)*k = 2/7 // - 2/7
(-1/7)*k-(2/7) = 0
(-1/7)*k-2/7 = 0
-1/7*k-2/7 = 0 // + 2/7
-1/7*k = 2/7 // : -1/7
k = 2/7/(-1/7)
k = -2
k = -2
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