I would like to instantiate a platform at the same x position of my player

So i got an endless jumper , my player jumps on platforms0. when he reaches a number of coins my other platforms need to be instantiated , but at the same x.position. It doesn't really work. It got it instantiated at the good y position but my x position is 4000. So I don't understand what i did wrong , here is my code. If somebody can help me. Thankssssss

public void CreateLeftPlatform() { lastPlatformPositionY +=DISTANCE_BETWEEN_PLATFORMS;

     Vector3  temp = player.transform.position ;
     temp.x=player.transform.position.x ;
     player.transform.position  = temp;
     
     GameObject newLeftPlatform= Instantiate(leftPlatform);
     newLeftPlatform.transform.position = new Vector3(temp.x,lastPlatformPositionY,0);
     newLeftPlatform.name = "LeftPlatform" + countPlatforms;
 
     countPlatforms ++;
     
     theCoinGenerator.SpawnCoins(new Vector3(newLeftPlatform.transform.position.x,lastPlatformPositionY +1,newLeftPlatform.transform.position.z));
 
 }