Yes -- if both functions f and g belong to the same exercise.
In any word problem, the symbol x always represents the same number no matter where it appears.
Therefore, once you know that x = 2, then all of the x's everywhere in the exercise equal 2.
For future reference, it's best on these boards to include the exercise that you're talking about, just to be sure that people understand what's going on. The more information that you provide, the better, quicker responses you'll get.
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