If people [?] (with each other), they talk in order to reach an agreement which is to their [?] (good for them both).
For example:
[?]
[?]
[?]
[?]
[?]

Negotiations also take place to [?] (decide arguments) such as:
[?]
[?]
[?]

Word combinations with "negotiations":
[?] negotiations - are very difficult and tiring, with a lot being discussed.
[?] negotiations - are very difficult and could easily fail.
[?] negotiations - take place at the last possible moment of the time available.
[?] negotiations - take a very long time.

Someone who takes part in negotiations is a [?], and someone who is good at getting what they want is a [?] negotiator.