An equation can be written for your number (n) as follows. 3n - 1 = n + 19 2n - 1 = 19 (subtract n from both sides) 2n = 20 (add 1 to both sides) n = 10 (divide both sides by 2)

##### The number is 10.

__Check__3*10 - 1 = 29 = 10 + 19