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The expression given is:

\[
28.9 - 20.8 + 3.9
\]

To simplify, we follow the standard order of operations (left to right for addition and subtraction in this case):

1. **Subtract** \( 28.9 - 20.8 \):
   \[
   28.9 - 20.8 = 8.1
   \]

2. **Add** \( 8.1 + 3.9 \):
   \[
   8.1 + 3.9 = 12.0
   \]

Thus, the simplified result is:

\[
\boxed{12.0}
\]

Would you like a breakdown of each step? 

Here are some related questions to explore:
1. What happens if we change the operation order in such expressions?
2. How would rounding each term before calculating affect the answer?
3. Can we add parentheses to get a different result?
4. How does this relate to algebraic simplification?
5. What other properties of addition and subtraction might apply here?

**Tip:** When simplifying expressions, always remember to apply the operations from left to right when dealing with addition and subtraction alone.

Learn how to simplify the expression 28.9 - 20.8 + 3.9 with a step-by-step guide. This problem demonstrates basic arithmetic and order of operations, suitable for students in Grades 5-6.

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