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https://apps.microsoft.com/detail/9pp6j54jcgfq

Rule of 3 Calculator (with "Invert" option) - Download and install on Windows | Microsoft Store
Rule of 3 Calculator is an app that allows the mathematical "Rule of Three" to be applied in an easier, faster and more practical way. An "Invert" option is included. YouTube video: https://youtu.be/lXSNpI47gQ4 The app supports JavaScript variables, math expressions, operators and functions (Examples below): 2 * 33 + Math.pow(3, 2) x = 100/37 + 256 * 1000 + Math.sin(3.14) - Math.pow(3, 2) x * 123 - 321