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You should use the to_dms expression.
to_dms($x, 'x', 3)
If your geometry is not in EPSG:4326, reproject it on the fly, like this:
to_dms(x(transform($geometry,'EPSG:2154','EPSG:4326')), 'x', 3)
Source : http://changelog.qgis.org/en/qgis/version/3.4-LTR/#map-expressions
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