There are a total of 14,100 tickets for 50 sold-out showings.
Let t be the number of people who bought tickets for each show.
t can be found by dividing the total tickets by the number of showings

You may also write the equation as

The equation remains the same whether you write t at the left or the right side of the equation.
Therefore, the correct option is D.
Now let us find out the exact value of t that is the number of people who bought tickets.

To each showing of the concert​, 282 people bought tickets.