[tex]\tt Step-by-step~explanation:[/tex]
The two red ticks indicate that those lines are the same length (Isosceles triangle).
Since the two lines are the same length, then that means that both of the angles are the same measure, too. One angle is measured at 71, so that means x = 71.
[tex]\Large\boxed{\tt Our~final~answer:~x=71^o}[/tex]
