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K in (-oo:+oo)
K/3 = 4/5 // - 4/5
K/3-(4/5) = 0
K/3-4/5 = 0
1/3*K-4/5 = 0 // + 4/5
1/3*K = 4/5 // : 1/3
K = 4/5/1/3
K = 12/5
K = 12/5
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