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k in (-oo:+oo)
3-3*k = 4*k-11 // - 4*k-11
3-3*k-(4*k)+11 = 0
3-3*k-4*k+11 = 0
14-7*k = 0 // - 14
-7*k = -14 // : -7
k = -14/(-7)
k = 2
k = 2
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