EDIT: I removed all “unused” partitions and the huge 17GB one containing Android using Aesus Partition Manager. I kept all the smaller partition labelled as EFI or “reserved” or “recovery” (this one is almost 500mb) then I formatted the unused space and mounted a folder inside my documents in Windows.
It’s not as nice as merging C with the now free partition (and have it expanded by 17GB) but I’d say it’s a decent result. I installed my Dropbox there so now I don’t have to worry to run out of space.
