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I'm thinking of a number. I divide it by 3 and get the result 7. What is the number I thought about?

I note with 'a' the number I think about.

Then the number 'a' divided by 3 is 7.

a ÷ 3 = 7

The inverse operation of the division is the multiplication.

a = 7 × 3

a = 21

I thought to number 21.

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