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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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