X+2x-3+x+4 =

solve for x

This is not an equation and thus cannot be solved for x. Ensure that you have copied down the original problem exactly.

If, on the other hand, you meant x + 2x - 3 + x = - 4, you do have an equation and can solve for x as follows:

4x - 3 = - 4 = > 4x = - 1 = > x = - 1/4

4x-1 is the answer ...