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K in (-oo:+oo)
(3/7)*((-5/6)*K+1) = 0
3/7*(1-5/6*K) = 0
1-5/6*K = 0 // - 1
-5/6*K = -1 // : -5/6
K = -1/(-5/6)
K = 6/5
K = 6/5
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