Answer:
Angles 3, 4, and 7
Explanation:
∠3=x because vertical angles(angles opposite each other on crossing lines) are congruent.
∠4=x because corresponding angles(the angles which are formed in corresponding corners with the transversal when two parallel lines are intersected by the transversal) are congruent.
∠7=∠4 because vertical angles are congruent.
∠7=x because of the transitive property of equality