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やるんだよ

do it

→ 遣る
phrase Uncommon #13,345
do it The exact meaning depends on context: it can state that someone does or did something, or tell someone to do it. The ending んだよ adds an explanatory or emphatic tone; the phrase is informal.
JA: 宿題は今日やるんだよ。
EN: You’re doing your homework today.

たまにテニスやるんだよ。

I play tennis every now and then.

ルームメイトがパーティーをやるんだよ。

My roommate is throwing a party.

やるんだよ

You're going to do it.

— コーカサスの虜 (1996)

やれって言ったらやるんだよ

If I tell you to do it, you do it.

— 紅夢 (1991)

トムはいつも月曜の朝にそれやるんだよ。

Tom always does that on Monday mornings.