7 + x

Twice the quantity of seven plus x

2(7 + x)

Difference of x and seven

x - 7

The phrase

*is the same as*means equal to. This is our algebraic expression:

**2(7 + x) = x - 7**

If the problem asks you to solve for x, distribute 2 on the left side:

14 + 2x = x - 7

Subtract x from the right side

14 + x = -7

Subtract 14 from each side

**x = -21**