Following are a number of back-translations as well as a sample translation for translators of Amos 2:9:

• Kupsabiny: “God is saying,
  ‘I am the one who destroyed the Amorites for the sake of my people of Israel.
  Those Amorites were tall like cedars
  and strong like kōrōs trees.
  I destroyed those people from/at the branches
  and uprooted their roots.” (Source: Kupsabiny Back Translation)
• Newari: “In spite of that, I myself destroyed the Amorites before them completely
  whose height was like the height of cedars
  and whose strength was like the strength of an oak tree.
  I destroyed their fruit above and their roots from below. ” (Source: Newari Back Translation)
• Hiligaynon: “But I, what- I -did for/to them who-come-from-Israel, I destroyed the Amornon, even-though these people are tall as-if a cedar tree and firm/sturdy as-if an oak tree. I destroyed them until no one was left among them.” (Source: Hiligaynon Back Translation)
• English: “Long ago, to assist your ancestors, I got rid of the Amor people-group.
  They seemed to be as tall as cedar trees
  and as strong as oak trees,
  but I got rid of them completely,
  as easily as someone cuts off the branches of a tree and then digs out all its roots.” (Source: Translation for Translators)