Choose a number from 1 to 9, multiply by 3, add 3, multiply by 3, and then add up ten digits. Why is it always equal to 9? I can't figure it out!

Choose a number from 1 to 9, multiply by 3, add 3, multiply by 3, and then add up ten digits. Why is it always equal to 9? I can't figure it out!

Let this number be x, then from the question: (3x + 3) * 3 = 9 (x + 1), it is obvious that this number can be divided by 9, and the characteristic of being divided by 9 is that the sum of all of you is a multiple of 9

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