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