To solve the inequality \( x + 10.5 < 20.2 \), we need to isolate \( x \).
- Subtract \( 10.5 \) from both sides of the inequality:
\[ x + 10.5 - 10.5 < 20.2 - 10.5 \]
- Simplifying both sides gives:
\[ x < 9.7 \]
Now, rewriting the inequality with \( x \) first, we have:
\[ x < 9.7 \]