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k in (-oo:+oo)
k/12 = 9/4 // - 9/4
k/12-(9/4) = 0
k/12-9/4 = 0
1/12*k-9/4 = 0 // + 9/4
1/12*k = 9/4 // : 1/12
k = 9/4/1/12
k = 27
k = 27
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