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K in (-oo:+oo)
K/7+0.6 = 57 // - 57
K/7-57+0.6 = 0
1/7*K-56.4 = 0 // + 56.4
1/7*K = 56.4 // : 1/7
K = 56.4/1/7
K = 394.8000079
K = 394.8000079
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