For what value of x is line a parallel to line b?

x=?

urgent

The angle of 80 degrees is the same angle as the one with the equation. That equation has to equal 80 somehow.

80 - 20 (from equation) = 60 
60 ÷ 2 (also from equation) = 30

x = 30 To make sure plug it in
(2 x 30)+ 20
60 + 20 = 80

x should equal 30

Please correct me if wrong

What is the last question i don’t see it?