Question

What is the expression for "the difference between five times a number and twice that number"?

Answer 1

Let the number be n.
5n - 2n = 3n

Answer 2

Let

x-----------> the number

we know that

The expression "the difference between five times a number and twice that number" is equal to

$5x-2x$

therefore

the answer is

$5x-2x$