Angle DCG is supplementary with angle DCE that is DCE is 180 - 86 = 94.
The sum of angles CDE, DCE, CED must equate to 180 since they describe a triangle, CDE = 35, DCE = 94 and thus CED = 180 - 35 - 94 = 51.
So the answer is 51.
Hope this helps.
