What key would this chord progression be in and what scale would I use to solo over it?

Hello I am pretty new at guitar and I was Messi ya round and found a cool chord progression of G7 C7 D7, I made this up trying to find a chord progression for the g mixylodian scale but I tried to play some of it over the chords and I didn’t sound right. Any help would be great! Also don’t roast me because I dont really know much music theory

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