Geometry Essentials · Challenge problem

Segments $AB$ and $CD$ intersect at point $X$, with $A$, $X$, $B$ collinear in that order and $C$, $X$, $D$ collinear in that order (so $\triangle AXC$ and $\triangle BXD$ sit on opposite sides of $X$). If $m\angle XAC=35^\circ$, $m\angle XCA=48^\circ$, and $m\angle XBD=20^\circ$, find $m\angle XDB$.