I have geometrical question which I'm trying to solve for a while now and it goes like this :

```
given a Line AB and 2 arbitrary points on one side of that line (C and D).
suggest a method to find a point M along AB so that ∠CMA = ∠DMB

```

[![enter image description here](https://i.stack.imgur.com/KbEjX.jpg)](https://i.stack.imgur.com/KbEjX.jpg)

can I please get direction to the solution ? 
Thanks!