2-x+3-5=4

-4  is the answer.

Step by step:

2 - x + 3 - 5  =  4                    Combine 3 - 5:

2 - x - 2  =  4                          Combine 2 - 2:

   -x        =  4                          Divide both sides by -1:

         x  =  -4

So, 2+3-5 is 0. x has to be a negative to get a positive outcome. X is equal to -4. I think this is the answer.