when 8 is subtracted from a certain number and the result is multiplied by 3 the final answer is 21. What is the original number

Respuesta :

Answer: The original number is 15.

Step-by-step explanation:

Answer:

15

Step-by-step explanation:

(x-8)*3=21

x-8=21/3

x-8=7

x=7+8

x=15