Below are two parallel lines with a third line intersecting them.

56 degrees
Step-by-step explanation:
So those angles are called alternate exterior angles because they happened at the difference intersections along the transversal on opposite sides of that transveral while on the outside of the lines that the transversal goes through.
If these lines that the transversal goes through are parallel then the alternating angles are congruent.
So they are because of the little >> things on those lines.
So x=56 degrees

Letter b hope it

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