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

To simplify the expression x + (x + 10) + 2(x + 10), we need to combine like terms.

First, distribute the 2 to the terms within the parentheses:

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

Now combine like terms:

x + x + 2x + 10 + 20

This simplifies to:

4x + 30

Therefore, x + (x + 10) + 2(x + 10) simplifies to 4x + 30.