Question

find x solve if you can

Answer 1

I think it's 20 degrees

Answer 2

There's lot of construction.

Name the points .

Draw a line from vertex of side

containing 60° and20° such that one

angle is 40° and other 20°.

Take the property of isosceles∆ and draw a line .

We get x=30°

Refer to the attachment below for whole solution

It's a IMO question.