\[\boxed{\mathbf{307\ (307)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\[\angle ABC = 106{^\circ};\ \ \ \angle ABD = 34{^\circ}.\]
\[\angle DBC = \angle ABC - \angle ABD =\]
\[= 106{^\circ} - 34{^\circ} = 72{^\circ}.\]
\[Ответ:\ \ 72{^\circ}.\]