Answer:
[tex]7k + 4( \frac{1}{4} k - 6) = 8k + 3k + 12 \\ \\ 7k + k - 24 = 11k + 12 \\ 8k - 24 = 11k + 12 \\ - 3k = 36 \\ { \boxed{ \boxed{k = - 12}}}[/tex]
