Algebraic Calculator Developer

I have a mathematical problem related to a video game that I cannot solve. I'm offering 100 dollars to anyone who comes up with a solution, and makes a simple calculator with the solution. The problem is described in this spreadsheet. Please read it before contacting me. https://docs.google.com/spreadsheets/d/1b7J3gmEsKXdg5S7edLrwDv4Xyf8yO0hpFWip2y11bOg/edit#gid=0