\[\boxed{\mathbf{1173}\mathbf{.}\mathbf{\ }}\]
\[Пусть\ \angle DBE = x;\]
\[\angle ABE = x + 34{^\circ};\]
\[\angle CBD = x + 23{^\circ}.\]
\[Прямой\ угол\ равен\ 90{^\circ}.\]
\[Составим\ уравнение:\]
\[x + x + 34 + x + 23 = 90\]
\[3x + 57 = 90\]
\[3x = 90 - 57\]
\[3x = 33\]
\[x = 11{^\circ} - \angle DBE.\]
\[Ответ:11{^\circ}.\]