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K in (-oo:+oo)
(-4*K-1)/3 = -7 // + 7
(-4*K-1)/3+7 = 0
(-4*K-1)/3+(3*7)/3 = 0
3*7-4*K-1 = 0
20-4*K = 0
(20-4*K)/3 = 0
(20-4*K)/3 = 0 // * 3
20-4*K = 0
20-4*K = 0 // - 20
-4*K = -20 // : -4
K = -20/(-4)
K = 5
K = 5
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