Excel can solve for unknown variables, either for a single cell with Goal Seek or multiple cells with Solver.

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.

In designing the spreadsheet optimizer that is bundled with Microsoft Excel, we and Microsoft made certain choices in designing its user interface, model processing, and solution algorithms for linear ...

The popular Solver for Excel add-on has been redeveloped for Excel 2008 by Frontline Systems and Microsoft.