Conversion of EPSG:3857 coordinate to UTM

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I'm trying to convert coordinates from Google Maps using the PostGIS.

I'm using this query:

SELECT ST_AsText(ST_Transform(ST_GeomFromText('POINT(-29.16297 -51.1795034)', 900913), 29182));The problem is that when I put a point on the map using the UTM coordinates, it is in a different place.

Is there a chance of one of these SRIDs be wrong?

Thanks in advance.



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