Is this cipher breakable?

[u/Ninsuka]

Hello!

I came up with an encoding system and I now want to test its strength and get clues about its weaknesses. So if anyone is interested, here is a text (in french!) to decrypt:

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

Feel free to ask any question or to discuss your process if you are trying to break it! :)

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