Explanation:
Hey there!!
Just do it in a simple way.
Use the properties of parallel lines, and find the value of x to find angke 1.
angle 1= angle 2 { alternate angles on parallel lines are equal }

or, 3x-2x = 20°-10°
x= 10°.
now,
angle 1= 2x+ 20°
=2×10°+20°
Therefore, the measure os angle 1 is 40°.
Hope it helps...