Let's substitute \( x = 2 \) into the equation \( x + 1 = x + 1 \).
Starting with the left side:
\[ 2 + 1 = 3 \]
Now, looking at the right side:
\[ 2 + 1 = 3 \]
Both sides of the equation result in \( 3 \), which means that the equation holds true:
\[ 3 = 3 \]
So, when we substitute \( 2 \) for \( x \), the equation becomes:
\[ 3 = 3 \]
In the format you provided:
\[ ? + 1 = ? + 1 \]
We can replace the questions marks with \( 2 \):
\[ 2 + 1 = 2 + 1 \]
Overall, the completed equation is:
\[ 2 + 1 = 2 + 1 \]
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