WILL GIVE BRAINLEST. How do I do this my notes aren’t making sense

Answer:
[tex]m\angle x=80^o[/tex]
Step-by-step explanation:
The question is
Find the measure of angle x
we know that
In this problem
[tex]m\angle x=80^o[/tex] ----> by alternate interior angles
Because, each pair of these angles are inside the parallel lines, and on opposite sides of the transversal.