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k in (-oo:+oo)
k/4+k/6 = k-7 // - k-7
k/4+k/6-k+7 = 0
7-7/12*k = 0 // - 7
-7/12*k = -7 // : -7/12
k = -7/(-7/12)
k = 12
k = 12
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