Let $K$ be the point of intersection of $AB$ and the line touching the circumcircle of $\triangle ABC$ at $C$ where $m(\widehat {A}) > m(\widehat {B})$. Let $L$ be a point on $[BC]$ such that $m(\widehat{ALB})=m(\widehat{CAK})$, $5|LC|=4|BL|$, and $|KC|=12$. What is $|AK|$?

$ 
\textbf{(A)}\ 4\sqrt 2
\qquad\textbf{(B)}\ 6
\qquad\textbf{(C)}\ 8
\qquad\textbf{(D)}\ 9
\qquad\textbf{(E)}\ \text{None of the above}
$
1. Given that $K$ is the point of intersection of $AB$ and the line touching the circumcircle of $\triangle ABC$ at $C$, and $L$ is a point on $[BC]$ such that $m(\widehat{ALB}) = m(\widehat{CAK})$, $5|LC| = 4|BL|$, and $|KC| = 12$.
2. We need to find $|AK|$.

3. Since $\angle{ABL} = \angle{ABC} = \angle{KCA}$, we have $\triangle{ALB} \sim \triangle{KAC}$ by AA similarity criterion. This implies that $\angle{CKA} = \angle{LAB}$.

4. Furthermore, $\angle{CAB} = \angle{CKA} + \angle{KAC} = \angle{CAL} + \angle{LAB}$, so $\angle{CAL} = \angle{KAC}$ and $AL \parallel KC$.

5. Thus, $\triangle{ABL} \sim \triangle{KBC}$ by AA similarity criterion, and $\frac{AB}{BK} = \frac{LB}{BC}$.

6. Given $5LC = 4BL$, we get $\frac{BL}{LC} = \frac{5}{4}$, and thus $\frac{AB}{BK} = \frac{5}{9}$.

7. It follows that $AB = 5k$, $AK = 4k$, and $BK = 9k$ for some $k > 0$.

8. By the Power of a Point theorem, we have:
   \[
   KC^2 = AK \cdot AB \implies 12^2 = 144 = (4k)(9k) = 36k^2
   \]
   Solving for $k$, we get:
   \[
   36k^2 = 144 \implies k^2 = 4 \implies k = 2
   \]

9. Therefore, $AK = 4k = 4 \times 2 = 8$.

The final answer is $\boxed{8}$.