 <translate> Give the step-by-step reasoning process and then the final answer. Henry needs to declutter his book collection of 99 books. From his bookshelf, he was able to fill 3 boxes of 15 books each to take to a donation center. He had 21 books in a room he could donate, 4 on his coffee table and 18 cookbooks stashed in the kitchen. When he dropped them off, he noticed a box of books that had a "free to a good home" note. He grabbed 12 books to take back to his place. How many books does Henry now have? <yor> Ṣàlàyé bí wọ́n ṣe ń ronú lẹ́ẹ̀kan-lẹ́ẹ̀kan, kó o sì wá sọ ìdáhùn tó o máa fún wọn. Ó yẹ kí Henry ṣètò àwọn ìwé rẹ̀ tí iye wọn jẹ́ mọ́kàndínlọ́gọ́rùn-ún. Láti inú àpótí tí wọ́n ń kó ìwé sí, ó kó ìwé mẹ́ta kúnnú rẹ̀, ìwé mẹ́ẹ̀ẹ́dógún ló wà nínú àpótí kọ̀ọ̀kan, ó sì kó wọn lọ síbi tí wọ́n ti ń ṣètọrẹ. Ó ní ìwé mọ́kànlélógún nínú yàrá kan tó lè fi ṣètọrẹ, mẹ́rin wà lórí tábìlì kọfí rẹ̀, ó sì ní ìwé ìdáná méjìdínlógún tí wọ́n fi pa mọ́ sínú ilé ìdáná. Nígbà tó fi wọ́n sílẹ̀, ó rí àpótí kan tí wọ́n fi ìwé sí, tí wọ́n kọ ọ̀rọ̀ sára rẹ̀ pé: "Owó ọ̀fẹ́ ni fún ilé rere". Ó mú ìwé méjìlá lọ sílé rẹ̀. Ìwé mélòó ni Henry ní báyìí? 