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There are many ways that the number 3 can be written as a function of the number 18. A function of any number (x) is often called f(x).

Let's say that f(x)=k.

So, in this case, x=18 and k=3. In other words, f(18)=3.

Now, you have to think of an equation that could relate the two numbers. For example, the easiest way to show how 3 is related to 18 is to show that 3 times 6 equals 18. Therefore, you could write that 3 = 18/6. And this equation proves that the number 3 is a function of the number 18.

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