Let there be a quadrilateral $ABCD$ such that $\angle CAD=45, \angle ACD=30, \angle BAC=\angle BCA=15$. Find $\angle DBC$.
Source: Moldova EGMO TST 2023
Tags: geometry
Let there be a quadrilateral $ABCD$ such that $\angle CAD=45, \angle ACD=30, \angle BAC=\angle BCA=15$. Find $\angle DBC$.