VBA Code to Auto Adjust Chart Axes Dependent Upon Cell Entry

I have an excel chart that I want to always be symmetrical. I am trying to write a code so that my chart will automatically adjust the x and y axes according to the value entered in a cell. The code I am using doesn't seem to be working so I am reaching out for help. Below is the code I have now and a picture of the spreadsheet. Any help would be GREATLY appreciated.

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