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There are certain conditions where K is a specific value that can allow you to ignore "x" because it is small, but I don't think Dr. Lavelle has taught us this and won't expect us to know it for testing purposes.
I was wondering this too but I know for homework problem 11.51 x is negligible for the reactants because their equilibrium concentration (when calculated with proper sigfigs) rounds off to be the same as their initial concentration.
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