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k in (-oo:+oo)
7-k-(7*k) = -17 // + 17
7-k-(7*k)+17 = 0
7-k-7*k+17 = 0
24-8*k = 0 // - 24
-8*k = -24 // : -8
k = -24/(-8)
k = 3
k = 3
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