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k in (-oo:+oo)
(-1/7)*k = 10/7 // - 10/7
(-1/7)*k-(10/7) = 0
(-1/7)*k-10/7 = 0
-1/7*k-10/7 = 0 // + 10/7
-1/7*k = 10/7 // : -1/7
k = 10/7/(-1/7)
k = -10
k = -10
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