This number riddle can be solved by working backward from the final result.
Let the unknown number be x:
2x + 12 = 30
First, subtract 12 from both sides:
2x = 18
Then divide both sides by 2:
x = 9
You can check the result:
9 × 2 = 18
18 + 12 = 30
Answer: 9
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9