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I built my own Excel toolbar using basic VBA, and it works in every spreadsheet I open

VBA may have a bad reputation, but it's still one of the most effective ways to automate repetitive actions in standard XLSX ...
Houston Chronicle

How to Use Excel's Functions to Solve Systems of Equations

Excel can solve equations through several of its mathematical functions, but the single Excel tool that works on the largest variety of equations is the program's Solver Add-in. This tool reads an ...