Question

How do you translate "double the difference of a number and seven" into a mathematical expression?

Answer 1

If `x` represents "a number", then the mathematical expression you want is `2(x-7)=2x-14`.

Explanation:

The difference of the number `x` and `7` is `x-7`. Doubling this means to multiply it by 2 to get `2(x-7)`. If you want, you can expand this, by the distributive law, to get `2x-14`.