If $ABCDE$ is a regular pentagon and $X$ is a point in its interior such that $CDX$ is equilateral, compute $\angle{AXE}$ in degrees.

[i]2020 CCA Math Bonanza Lightning Round #1.3[/i]
1. **Understanding the problem**: We are given a regular pentagon \(ABCDE\) and a point \(X\) inside it such that \(\triangle CDX\) is equilateral. We need to find \(\angle AXE\).

2. **Properties of a regular pentagon**: In a regular pentagon, each interior angle is \(108^\circ\). This is because the sum of the interior angles of a pentagon is \(540^\circ\) and each angle in a regular pentagon is equal:
   \[
   \frac{540^\circ}{5} = 108^\circ
   \]

3. **Equilateral triangle \(\triangle CDX\)**: Since \(\triangle CDX\) is equilateral, each angle in \(\triangle CDX\) is \(60^\circ\). Therefore:
   \[
   \angle CDX = \angle DCX = \angle CXD = 60^\circ
   \]

4. **Finding \(\angle XDE\)**: Since \(D\) is a vertex of the regular pentagon, \(\angle CDE = 108^\circ\). In \(\triangle XDE\), we have:
   \[
   \angle XDE = \angle CDE - \angle CDX = 108^\circ - 60^\circ = 48^\circ
   \]

5. **Isosceles triangle \(\triangle DXE\)**: Since \(XD = DE\) (as \(XD\) is a side of the equilateral triangle and \(DE\) is a side of the regular pentagon), \(\triangle DXE\) is isosceles. Therefore, the base angles are equal:
   \[
   \angle DXE = \frac{180^\circ - \angle XDE}{2} = \frac{180^\circ - 48^\circ}{2} = \frac{132^\circ}{2} = 66^\circ
   \]

6. **Finding \(\angle CXB\)**: Since \(\triangle CDX\) is equilateral, \(\angle CXD = 60^\circ\). Also, \(\angle BXC\) is the same as \(\angle DXE\) because of symmetry in the regular pentagon:
   \[
   \angle BXC = \angle DXE = 66^\circ
   \]

7. **Finding \(\angle BXE\)**: The sum of angles around point \(X\) is \(360^\circ\). Therefore:
   \[
   \angle BXE = 360^\circ - (\angle CXD + \angle DXE + \angle BXC) = 360^\circ - (60^\circ + 66^\circ + 66^\circ) = 360^\circ - 192^\circ = 168^\circ
   \]

8. **Finding \(\angle AXE\)**: Since \(X\) is symmetrically placed in the pentagon, \(\angle AXE\) is half of \(\angle BXE\):
   \[
   \angle AXE = \frac{\angle BXE}{2} = \frac{168^\circ}{2} = 84^\circ
   \]

The final answer is \(\boxed{84^\circ}\).