Intermediate Mathematical Challenge 2026 Q8

The diagram shows two triangles $ABC$ and $DBE$ with $AB$ and $DE$ meeting at $A$. Angle $CAB$ is $20^\circ$ and angle $DBE$ is $30^\circ$. Angle $x$ is $\theta^\circ$ and angle $y$ is $\phi^\circ$. What is the relationship between $x$ and $y$?