Answer:
8
Step-by-step explanation:
The interior angles of a triangle always add up to 180°.
As QE=ED=QD
so, ∠Q=∠E=∠D=180°/3=60°
As, ∠D=5x+20
60=5x+20
5x=40
x=8
Hope, this helps you.
x= 8
QE=ED=QD
SO;
Sum of angles =180
each angle = 60
5x+20= 60 —> 5x =60-20 —> 5x = 40
x = 40/5 —> x = 8
I hope I helped you^_^
