Answer:
x = 75°
Step-by-step explanation:
∠ ABD and ∠ CBE are vertically opposite angles and are congruent, so
∠ ABD = 15°
The sum of the 3 angles in Δ ABD = 180° , then
x = 180° - (90 + 15)° = 180° - 105° = 75°
