algebra question. help?

The Eye Surgery Institute just purchased a new laser machine for $500,000 to use during eye surgery. The Institute must pay the invent $550 each time the machine is used. If the Institue charges $2,000 for each laser surgery, what is the minimum number of surgeries that must be performed in order for the Institute to make a profit?

The magic number that must be met to make a profit is the $500,000 plus the number of procedures times $550
Let x = the number of procedures
so 2000x -550x = 500000
1450x = 500000
x= 345 procedures
Note that this neglects such things as what return $500,000 could have earned in an investment. Also, depreciation of the machine and staff and supplies to run the machine.

Small Incision Sutureless Cataract Surgery (SICS)