Works fine. Very similar to Excel goal seek. Most people are either failing to give the extension permission to access Sheets, not specifying the three components correctly, or some other form(s) of human error. You need to specify a cell with a formula (e.g. "=E7*4"), a cell which is a component of that formula (e.g. "E7"), and a value you want the formula cell to be changed to by adjusting the component cell (e.g. "100"). In the example, E7 should iterate until reaching a value of 25... causing the formula cell to have a value of 100.
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