The sum of 14 and a number is equal to 17

I assume that the question is: what is this nunber?

we write this like this:

The sum of 14 and a number  is 14+x

we know that this equals 17, so: 14+x=17.

Let's substract 14 from both sides:

x=17-14

x=3

so the number is 3.

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