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K in (-oo:+oo)
K/7 = 9/6 // - 9/6
K/7-(9/6) = 0
K/7-3/2 = 0
1/7*K-3/2 = 0 // + 3/2
1/7*K = 3/2 // : 1/7
K = 3/2/1/7
K = 21/2
K = 21/2
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