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k in (-oo:+oo)
-k/5 = 7/5 // - 7/5
-k/5-(7/5) = 0
-k/5-7/5 = 0
-1/5*k-7/5 = 0 // + 7/5
-1/5*k = 7/5 // : -1/5
k = 7/5/(-1/5)
k = -7
k = -7
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