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Maybe I’ve just a black out. But I wanted to notate a V7sus (inversion 1) writing a dominant 7 without the suspension of the 4th in RNA. No idea ...

g,c,d,f => c,d,f,g

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The suspension won't be shown in the Roman numerals, but it can be shown in the figured bass:

enter image description here

As long as we remember that figured bass shows the intervals above the bottom pitch, it just becomes a simple counting exercise.

Combined with Roman numerals, we would label beats 3 and 4 of the first measure as a V chord, and we just have to understand that the C on beat 3 is a suspension:

enter image description here

For a related question, see Figured bass 52?

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  • I returned to edit my answer with a suggestion to use a 45 figure, realized I misunderstood the inversion aspect, and removed my answer entirely. Richard's answer makes perfectly clear what to do. – Michael Curtis Apr 4 '19 at 18:07

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