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The mixture of "a" and "э" and "ы" is called "ер" [йэр][/quote]
aka schwa.

But for example "золото здесь",

the first o would be o, the second is the mixture of "a" and "э" and "ы" and because здесь is stressed, the last o must be actually "a"?[/quote]
I don't think...

I am pronouncing the first O here just like the 2nd one in "poltora".