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k in (-oo:+oo)
k/22 = 9/18 // - 9/18
k/22-(9/18) = 0
k/22-1/2 = 0
1/22*k-1/2 = 0 // + 1/2
1/22*k = 1/2 // : 1/22
k = 1/2/1/22
k = 11
k = 11
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