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K in (-oo:+oo)
K/3.7+4.1 = 9.1 // - 9.1
K/3.7-9.1+4.1 = 0
0.27027027*K-5 = 0 // + 5
0.27027027*K = 5 // : 0.27027027
K = 5/0.27027027
K = 18.50000002
K = 18.50000002
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