Respuesta :
2 - x. because if you replace the x with any number you will get the same answer except for in 2-x. Ex
2 - 4 = -2
4 - 2 = 2
-2 + 4 = 2
4 + (-2) = 2
2 - 4 = -2
4 - 2 = 2
-2 + 4 = 2
4 + (-2) = 2