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It depends what you are trying to accomplish, but sometimes you pick a value of x. For example, if you want to graph a function, one approach is to pick several different values of x, solve the equation for each value, and write that as a point on the graph. It may then be possible to connect the points into some kind of coherent shape (although this depends upon the particular function - some are easier to graph than others).

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Q: Do you pick the number for x in a function notation?
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