X+2x-3+x+4 =

solve for x

4x-1 is the answer ...

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