Detecting draggable object position change

How do I...?
1

Hello!
I have draggable objects in my game and i need to detect if they have moved to another position. How would I tackle that?
Thanks

2 
If X position of Object is not Variable(oldx) or Y position of Object is not Variable(oldy) {
  Do Something
}
Set variable oldx to Object.X()
Set variable oldy to Object.Y()
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