Answer: n = 5
Step-by-step explanation: To solve for n, we must first isolate the term containing n which in this problem is 3n.
Since 8 is being added to 3n, we subtract 8 from both sides of the equation to isolate the 3n. On the left, the +8 and -8 cancel out and on the right 23 - 8 is 15.
So we have 3n = 15.
Now we can finish things off by just dividing both sides of the equation by 3. On the left the 3's cancel and on the right 15 divided by 3 is 5 so n = 5 and you can check your answer by plugging 5 back in for n in the original equation which is shown below in bold.
3(5) + 8 = 23 or 15 + 8 = 23.