Add a Vertex (Ctrl-left click), and set the vertex location to origin:
type ShiftS + uU (Cursor to Center), then
type ShiftS + tT (Selection to Cursor)
Press gG to enter grab mode. Enter movement in x direction with 0-9 decimal point . and negativnegative -, Tab enter y value (like the x value), Tab enter z value (like the x value).
Alternatively, you can limit the transform on a axis by pressing x, y or z in grab mode. Or Shift and x, y, z to limit on the other axis .