![](https://cdn.mathpix.com/cropped/2024_05_06_7adbd1f2e5e559c8684fg-19.jpg?height=186&width=2015&top_left_y=1598&top_left_x=17)

$ABCD$ - a convex quadrilateral. It is known that $\angle CAD = \angle DBA = 40^{\circ}, \angle CAB = 60^{\circ}, \angle CBD = 20^{\circ}$. Find the angle $\angle CDB$.