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That depends on the specific situation. But usually, if it is part of an equation, you use the methods to solve equations, which usually involver doing the same operation on both sides of the equation, until you have the "x" alone on one side. Here is an example:

2x + 5 = 17

(The idea is to get "x" alone on one side. Start by subtracting 5 on both sides.)

2x + 5 - 5 = 17 - 5

2x + 0 = 12

(The previous two steps are included for to explain the reasoning. It is not usually necessary to write them out.)

2x = 12

(Now divide both sides by 2 - once again, to get the "x" alone - to "isolate" it.)

x = 6

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Q: How do you find x in algebra?
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