Given:
In triangle ABC,
Sum of the angles in a triangle is 180 degree
[tex]\angle ACB=\angle DCE[/tex][tex]\begin{gathered} 31^{\circ}+83^{\circ}+x=180^{\circ} \\ 114^{\circ}+x=180^{\circ} \\ x=180^{\circ}-114^{\circ} \\ x=66^{\circ} \end{gathered}[/tex]
