Quote Originally Posted by iCake View Post
So you need a hyphen in both of them.
A dash (—), not a hyphen (-).

Quote Originally Posted by iCake View Post
Единственный способ достичь успеха в этом бизнесе - организовать крупную сеть по привлечению клиентов в России
The subject and predicate are both infinitive verbs.
No. The subject is способ.

Quote Originally Posted by iCake View Post
Okay, if both a subject and predicate are of the same part of speech (e.g. both nouns) you need to put a hyphen between them.
They do not have to be of the same part of speech.
Курение (noun) — это плохо (adverb).
Курить (verb) — плохо (adverb).
Курение (noun) — это плохо (adverb).
Единственный способ (noun) — организовать (verb) крупную сеть.
etc.