You could argue it's implied that a-z sequence contains x. But I agree that it's a bit ambiguous.
Here's what a better notation would look like:
(1-x)(2-x)(3-x)...(n-x) for x from N
Or
(b0 - x)(b1 -x)(b2-x)...(bn-x)
This way, both Bn and X could be any number and not just natural ones.
If you think USA is like Russia, you're way off. USA is a flawed democracy. Very flawed, but still a democracy, since your votes matter. Russia is an informational autocracy. It's ruled by a spin dictator who lies the country is a democracy whilst killing his real opponents and posing clowns as his real ones. Mind you, I am Russian.
Edit: Now that I'm looking at it again, US may be considered a capitalist oligarchy, I'm fine with that classification. I do, however, disagree about Russia being one, it's informational autocracy (hence "way off" to begin with)