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What does the dash mean over the symbols here? How to convert these Roman numerals to numbers?

Image showing roman numerals as replicated in the text form below.

Textual equivalent of the image:

$$\overline{\text{M}}\,\overline{\text{L}}\,\overline{\text{V}}\text{MCCLXXIX} \text{ et } \overline{\text{C}}\,\overline{\text{M}}\,\overline{\text{V}}\text{CCCLXXXII}$$

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The bar means multiplying by $1000$, so the numbers in the picture are $1056279$ and $905382$.

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Typically the dash over the Roman numeral multiplies that part by 1000.

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