OET interlinear ECC 3:20

uW Translation Notes:

Note 1 topic: figures-of-speech / euphemism

הַ⁠כֹּ֥ל הוֹלֵ֖ךְ אֶל־מָק֣וֹם אֶחָ֑ד

(the),everything go to/towards place one(ms)

Solomon is referring to death in a polite way by using the phrase going to one place. Depending on what is helpful for your readers, you could use a polite way of referring to this in your language, or you could state this plainly. Alternate translation: [Both are going to the grave]

Note 2 topic: figures-of-speech / metaphor

הַ⁠כֹּל֙ הָיָ֣ה מִן־הֶֽ⁠עָפָ֔ר וְ⁠הַ⁠כֹּ֖ל שָׁ֥ב אֶל־הֶ⁠עָפָֽר

(the),everything it_became from/more_than the,dust and,(the),everything return to/towards the,dust

Here Solomon is speaking as if people and animals were made from the dust and will become dust again. He is alluding to the way God created the first human being out of the ground. Your language may have a comparable expression that you can use in your translation, or you could state the meaning plainly. Alternate translation: [Both were made from dirt, and both will turn back into dirt]