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I believe you can check to see if dropping the x is valid. You do the calculation (with x dropped) and then seeing if the resulting concentration value for x is less than 5 percent of the original concentration of solution (what you started with). If it is, then your approximation is valid.
You can disregard x when K is less than 10^(-3) because it will be an extremely small value that won't affect your calculations. However, to ensure that you were correct in disregarding the x value, you must check if x is less than 5% of the original solution's concentration.
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