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Yes, it is possible to adjust the zoom level after using the fitBounds method in Google Maps API v3. You can use the setZoom method to set the new zoom level. For example:

// Create a new map
var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 10,
    center: {lat: 37.7749, lng: -122.4194}
});

// Create a LatLngBounds object
var bounds = new google.maps.LatLngBounds();

// Extend the bounds to include multiple locations
bounds.extend(new google.maps.LatLng(37.7749, -122.4194));
bounds.extend(new google.maps.LatLng(37.7749, -122.4195));
bounds.extend(new google.maps.LatLng(37.7748, -122.4194));
bounds.extend(new google.maps.LatLng(37.7748, -122.4195));

// Fit the map to the bounds
map.fitBounds(bounds);

// Set a new zoom level
map.setZoom(12);