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The words: "сердцебиение" and "долгосрочно" are compound words (they are composed of two component words each).
I have the impression that the first "e" is still pronounces as "e" in the word...

The stress on the word полтора is on "a", nevertheless the first unstressed "o" is pronounced as "o" and not as "a".
Does it play any role the fact that the word is composed etymologically from two...