How do you solve -3-x-2x?

To solve the expression (-3 - x - 2x), first combine the like terms involving (x). This gives you (-3 - 3x). If you're looking to simplify, the expression can be written as (-3 - 3x) or factored as (-3(1 + x)). If you need to solve for (x), you would need an equation, such as setting it equal to zero.