there is no decimal value, the . symbol represents multiplication so 24.4 = 96 

Thank you for the clarification! If the dot (.) is representing multiplication instead of a decimal point, then the expression can be interpreted as:

\[
24 \times 4 - 13 \times 7 + 4 \times 18 - 26 \times 5
\]

Let's solve this step-by-step:

1. Calculate each multiplication:
   - \( 24 \times 4 = 96 \)
   - \( 13 \times 7 = 91 \)
   - \( 4 \times 18 = 72 \)
   - \( 26 \times 5 = 130 \)

2. Substitute these values back into the expression:
   \[
   96 - 91 + 72 - 130
   \]

3. Perform the addition and subtraction from left to right:
   - \( 96 - 91 = 5 \)
   - \( 5 + 72 = 77 \)
   - \( 77 - 130 = -53 \)

So, the result of the expression is:

\[
\boxed{-53}
\]

Would you like to see more details or have any questions about this calculation?

### Related Questions:
1. What if we use different numbers in this expression?
2. How does changing the order of operations affect the final answer?
3. Can we simplify the calculations further using distributive properties?
4. What are some common mistakes to avoid when interpreting mathematical symbols?
5. How can expressions like this be applied in algebraic problem-solving?

### Tip:
Always ensure to clarify the notation and symbols used in mathematical expressions, especially when they can have multiple meanings, such as the dot symbol (.) which can represent both multiplication and a decimal point.

Explore the interpretation of arithmetic operations with symbolic representation. This problem involves understanding the use of symbols like dots for multiplication and their impact on calculations. Suitable for students in Grades 5-7.

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