Answer:
x = 16
Explanation:
Since the triangles are congruent, then corresponding angles are congruent.
∠ B and ∠ E are corresponding angles and congruent, thus
6x - 65 = x + 15 ( subtract x from both sides )
5x - 65 = 15 ( add 65 to both sides )
5x = 80 ( divide both sides by 5 )
x = 16