The owl was impressed and handed Sophia a clue: "The answer key is hidden in a treasure chest with a combination lock. The code is 39."

Sophia's eyes widened as she exclaimed, "That's the answer to question 4 on the Weekly Math Review Q2 4! I remember now – the correct answer is indeed 39!"

"Meet me at the Weekly Math Review Q2 4 answer key, and come prepared with your problem-solving skills!"

Sophia was intrigued and decided to embark on a quest to find the answer key. She packed her backpack with pencils, paper, and her favorite math snacks (cookies and calculator).

Sophia thought for a moment and replied, "Let me see... if I subtract 5 from both sides, I get 2x = 6. Then, I divide both sides by 2, and x = 3!"