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