It looks like you have an equation that isn’t fully clear due to the formatting. If you meant to write the equation as:
\[ x + _ = 2 + x \]
Then you can simplify it. However, if you meant to ask about solving for \( x \), then the equation simplifies as follows:
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Start with the given equation: \[ x + a = 2 + x \]
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Subtract \( x \) from both sides: \[ a = 2 \]
Here, \( a \) would just be a placeholder for whatever number could replace the underscore.
If your equation was different, please clarify, and I’d be happy to assist!