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K in (-oo:+oo)
K/4-4.2 = 11.8 // - 11.8
K/4-11.8-4.2 = 0
1/4*K-16 = 0 // + 16
1/4*K = 16 // : 1/4
K = 16/1/4
K = 64
K = 64
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