Two young mathematicians examine an equation.

Check out this dialogue between two calculus students (based on a true story):
Devyn
Riley, I have a question.
Riley
What’s on your mind?
Devyn
Suppose we have three exams.
Riley
Ok.
Devyn
On the first, I scored 74/100, and on the second I scored 84/100.
Riley
Not bad! What’s the question, though?
Devyn
What do I need to get on the third exam to average an 82% overall?
Riley
To find the average of three numbers, you add them and divide the sum by three.
Devyn
Yes, but how do I figure out how to get an 82%?

Let’s call Devyn’s score on midterm 3 as . According to Riley, Devyn’s exam average would be

In order to determine what score Devyn needs on his last exam,they will need to setup and solve an equation involving this expression.

Is the following an equation: ?
yes no