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K in (-oo:+oo)
K/10 = 9/2 // - 9/2
K/10-(9/2) = 0
K/10-9/2 = 0
1/10*K-9/2 = 0 // + 9/2
1/10*K = 9/2 // : 1/10
K = 9/2/1/10
K = 45
K = 45
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