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Three less than twice a certain number

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KookEinid
If you mean translate "three less than twice a certain number" to mathematical phrase then...

3 - 2x
2x - 3

*You can use any letter to represent the number.
 
Or...

-Assign any number as the value of x.

3 - 2(9)
3 - 18
-15
 
                                                                            -KookEin
Joanne11id
let x be the number so,
3 - 2x or 2x - 3