 
 <translate> Give the step-by-step reasoning process and then the final answer. Matias is a salesman in a bookstore. He sold 7 books on Tuesday and three times as many on Wednesday. If the sales from Wednesday were tripled on Thursday, how many books did Matias sell during these three days combined? <hau> Bayyana tsarin tunani mataki-mataki sannan kuma amsar karshe. Matias mai sayarwa ne a wani shagon sayar da littattafai. Ya sayar da littattafai 7 a ranar Talata kuma sau uku a ranar Laraba. Idan tallace-tallace daga Laraba sun ninka sau uku a ranar Alhamis, littattafai nawa Matias ya sayar a cikin wadannan kwanaki uku tare? 