i get this error in unity and can anyone help me? :     enter code here

    public class cameramover : MonoBehaviour {
	public GameObject player;
	public Vector2 playerpos;
	public Vector2 campos;

	void Start()
	{
	    playerpos = player.transform.position;
		campos = transform.position;
	}

	void Update () 
	{
		campos.x + 30 - playerpos.x;
		campos.y - playerpos.y;

	}
}


and i get this error can you help me?

and tell me what i did wrong

Only assignment, call, increment, decrement, await, and new object expressions can be used as a statement