Can someone walk me through this? (geometry - triangle congruence proof using sas theorem)

Angle A and Angle D are congruent because angles of an equilateral triangle are congruent.

Side AD is equal to side AD because of the reflexive property

Side AC is congruent to side DB because components of sides are congruent

Therefore, Triangle ACD is congruent to Triangle DBA

Part A: B)35
As the angle y° equals to angle 2x°, y=2x.
And the sum of the angle (x+y+5°)and the angle 2x° is 180°.Therefore,
x+y+5°+2x =180°
x+2x+5°+2x=180°
5x+5° =180°
5x =175°
x =35°

Part B: C)110°
As I said, y =2x
And the unlabled angle eaquals to the angle(x+y+5°).
Therefore,
the unabled angle= x+y+5°
=x+2x+5°
=3x+5°
=3(35°)+5°
=110°