So when I make click on the map a new marker is added, but if there's
a prev marker, it get deleted

  var prevMarker = null;
  google.maps.event.addListener(map, "click", function(event) {
placeMarker(event.latLng);
prevMarker = event.serviceObject;
});

function placeMarker(location) {
  var clickedLocation = new google.maps.LatLng(location);
  if (prevMarker != null) {
      prevMarker.setMap(null)
  }
  var marker = new google.maps.Marker({
      position: location,
      map: map
  });
};
};

But the code is just adding markers but no deleting previous ones

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