Solution: The average of 12, 15, and $ x $ is given by $ \frac{12 + 15 + x}{3} = 14 $. Multiply both sides by 3: $ 27 + x = 42 $. Subtract 27: $ x = 15 $. \boxed{15}

Sun, 19 Apr 2026 03:25:04 +0000

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