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K in (-oo:+oo)
K/7 = 5.4 // - 5.4
K/7-5.4 = 0
1/7*K-5.4 = 0 // + 5.4
1/7*K = 5.4 // : 1/7
K = 5.4/1/7
K = 37.80000076
K = 37.80000076
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