options:
1. 50°
2. 60°
3. 40°
4. 55°
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Answer:
Given angles form linear pair
which is equal to 180°
⇒ 45° + 2x + x + 15° = 180°
⇒ 60° + 3x = 180°
⇒ 3x = 180° - 60°
⇒ 3x = 120°
⇒ x = 120°/3
x = 40°
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