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K in (-oo:+oo)
K/2.7 = 21 // - 21
K/2.7-21 = 0
0.37037037*K-21 = 0 // + 21
0.37037037*K = 21 // : 0.37037037
K = 21/0.37037037
K = 56.70000006
K = 56.70000006
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