X + (x + 10) + (2x + 10)

To simplify the expression x + (x + 10) + (2x + 10), you combine like terms.

Combining the x terms: x + x + 2x = 4x

Combining the constant terms: 10 + 10 = 20

Putting it all together, the simplified expression is: 4x + 20

So when you add x, (x + 10), and (2x + 10) together, the result is 4x + 20.