Let 1 and 2 be two complex numbers satisfying |1 | = 9 and |2 | – |3|–|4i||=|4. Then the minimum value of |1 – 2 | is :

Let $\mathrm{z}_{1}$ and $\mathrm{z}_{2}$ be two complex numbers satisfying $\left|\mathrm{z}_{1}\right|=9$ and $\left|z_{2}\right|-|3|-|4 i||=| 4$. Then the minimum value of $\left|z_{1}-z_{2}\right|$ is: