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K in (-oo:+oo)
K/10.5 = 5.5/16.5 // - 5.5/16.5
K/10.5-(5.5/16.5) = 0
K/10.5-0.33333333 = 0
0.0952381*K-0.33333333 = 0 // + 0.33333333
0.0952381*K = 0.33333333 // : 0.0952381
K = 0.33333333/0.0952381
K = 3.49999979
K = 3.49999979
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