Question 1180465
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The statement of the problem is incomplete; we don't know which two angles are congruent.<br>
It is most likely that the measures given in terms of x for angles D and F imply that those are the two congruent angles.<br>
Using that interpretation....<br>
4x+1=5x-4
5 = x<br>
The measure of angles D and F is 4(5)+1 = 21 degrees each.<br>
From there determine the measure of angle E knowing that the sum of the three angles is 180 degrees.<br>