The left-hand side of an assignment must be a variable, a property or an indexer

I looked at other threads, but could not find an answer.

The error is on line 6, 7 and 8. Could someone help me out?

 using UnityEngine;
 using System.Collections;
 
 public class SaveLoad2 : MonoBehaviour {
 
     public void SaveLocation (Vector3 pos){ //Where pos is the position of the player
         PlayerPrefs.SetFloat("playerX") = pos.x;
         PlayerPrefs.SetFloat("playerY") = pos.y;
         PlayerPrefs.SetFloat("playerZ") = pos.z;
     }
     
     
     //Handles Load - Returns Vector3
 public    Vector3 GetLocation(){
         return new Vector3(PlayerPrefs.GetFloat("playerX"), PlayerPrefs.GetFloat("playerY"),PlayerPrefs.GetFloat("playerZ"));
     }
 
 }