**Answer:**

12

## Solution:

Let x be the number

3x + 9 = 5x – 15

Add 15 to both sides

3x + 9 + 15 = 5x – 15 + 15

3x + 24 = 5x

Subtract 3x to both sides

3x + 24 – 3x = 5x – 3x

24 = 2x

Divide 2 to both sies

24/2 = x

12 = x

Therefore the number is 12.

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