[tag[xx]tagging[]] [tag[xx]]<$count filter=[[tag[xx]tagging[]][tag[xx]]]/><$count filter="[!is[system]!tag[xx]!tag[xx]tagging[]]"/>
[all[]]-[tag[xx]tagging[]][tag[xx]]
as the inverse of the filter you had before.
[all[]]-[tag[xx]tagging[]]-[tag[xx]]