The sum of a number times 3 and 8 equals 9

Question

i dont understand this

Answer 1

You are trying to find the value of an unknown number.  Let's call the unknown number n:

 

The sum of a number (n) times 3 (3n) and 8 (3n+8) equals 9 (3n+8 = 9)

 

3n + 8 = 9

 

Solve for n.