*a number*means an arbitrary variable. We can pick any letter a-z except for i and e.

Let's choose x.

Twice a number means we multiply x by 2:

2x

ten added to twice a number

2x + 10

The phrase

*is the same as*means equal to. Set 25 equal to 2x + 10 to get our algebraic expression

**25 = 2x + 10**

If the problem asks you to solve for x, type it in our math solver and get

x =

**7.5**