Matias sold 7 * 3 = <<7*3=21>>21 books on Wednesday, as he sold three times more books than on Tuesday.
The sales from Wednesday were tripled on Thursday, which means Matias sold then 21 * 3 = <<21*3=63>>63 books.
That means in total Matias sold 7 + 21 + 63 = <<7+21+63=91>>91 books during these three days.
#### 91