to前面為什麼加逗點 像是這句 I will pay for the taxi,to even thing up.?

To前面為什麼加逗點 像是這句 I will pay for the taxi,to even thing up.?

I will pay for the taxi, to even thing up.
我會付計程車費，這樣才平等一點。

☆To even thing up, I will pay for the taxi.
我們試試把句子倒轉來寫, 不難發覺這是“ 2⃣️個 ”句子, 所以要加“逗號”。

☆ to + root verb (原動詞）＝ 為了.......

另例: To achieve my goal, I have to work hard.
為了達到我的目標，我必須努力。

謹供参考, 謝謝！🤔

even up=make even or equal=even thing up=That will even things up, make them equal=suppose A pays $100,B pays nothing; then B pays $98;that will make distance, value equal to get out of the Hotel. A & B payments are now even (=even thing up, if $100=$98 approximately.)