Sierra, let's look at what we have. It looks to me like we have one equation with one variable. Let x = the number of performances.
The cost of doing 2 performances is the $88,000 base plus $5900 for each of 2 performances. We would write this out as $88,000 + $5900(2).
Since we are doing x performances, we instead write $88,000 + $5900x.
As far as for what performances make, 2 performances would earn $7500(2), right? x performances would earn $7500x.
Now, we need what we earn to be equal to what we spent, so
88,000 + 5900x = 7500x
I bet you can solve it from here!