This may seem like a silly question but I can't seem to find something to tag a question asking a solution for an algebraic equation. There is a systems-of-equations tag, but its description seems to strongly imply that it should only be used for... ahem... a system with more than one equation.
Ok, but not all algebraic equations involve polynomials. The most recent example tagged "systems-of-equations" involves only exponentials (in a singe equation). N.B.: I see the commonly accepted def for "algebraic equation" involves only polynomials. What should we even call the other "algebraic" ones that aren't differential? — Respawned Fluff 21 mins ago
There is an equation: $$3^x + 7^x = 21^x$$ How to solve this?
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