The angle 3 and angle 7 are corresponding angle. So,
[tex]\angle3=\angle7[/tex]
Subtitute the measure of angles and obtain the value of x.
[tex]\begin{gathered} x+50=2x+20 \\ 2x-x=50-20 \\ x=30 \end{gathered}[/tex]
Determine the measure of angle 3.
[tex]\begin{gathered} \angle3=20+50 \\ =70 \end{gathered}[/tex]
So measure of angle
