json_decode Usage with multi dimension JSON code

I am having proble to extract a vlaue from this code

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{ “name”: “1600 Amphitheatre Parkway, Mountain View, CA”, “Status”: { “code”: 200, “request”: “geocode” }, “Placemark”: [ { “id”: “p1”, “address”: “1600 Amphitheatre Pkwy, Mountain View, CA 94043, USA”, “AddressDetails”: {“Country”: {“CountryNameCode”: “US”,”CountryName”: “USA”,”AdministrativeArea”: {“AdministrativeAreaName”: “CA”,”Locality”: {“LocalityName”: “Mountain View”,”Thoroughfare”:{“ThoroughfareName”: “1600 Amphitheatre Pkwy”},”PostalCode”: {“PostalCodeNumber”: “94043”}}}},”Accuracy”: 8}, “ExtendedData”: { “LatLonBox”: { “north”: 37.4251196, “south”: 37.4188244, “east”: -122.0809954, “west”: -122.0872906 } }, “Point”: { “coordinates”: [ -122.0841430, 37.4219720, 0 ] } } ] }

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I want to extract this value
-122.0841430

Using PHP json_decode (object or array), json_decode works fine for me with simple files but it doesnt work here for me here, any ideas?

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