To simplify the expression involving two fractions, \(-\frac{3}{4}\) and \(\frac{2}{5}\), we can combine them. If you're asking for the sum or difference, we would follow these steps:

### 1. Find a common denominator:
The least common denominator (LCD) between 4 and 5 is 20.

### 2. Rewrite both fractions with this common denominator:
\[
-\frac{3}{4} = -\frac{3 \times 5}{4 \times 5} = -\frac{15}{20}
\]
\[
\frac{2}{5} = \frac{2 \times 4}{5 \times 4} = \frac{8}{20}
\]

### 3. Now, combine the fractions:
\[
-\frac{15}{20} + \frac{8}{20} = \frac{-15 + 8}{20} = \frac{-7}{20}
\]

Thus, the simplified result of \(-\frac{3}{4}\) and \(\frac{2}{5}\) is:
\[
-\frac{7}{20}
\]

Would you like further explanation or have any questions?

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**Related questions:**
1. How do you simplify complex fractions?
2. Can you show an example of multiplying two fractions?
3. How do you find the least common denominator of multiple fractions?
4. How do you subtract mixed fractions?
5. How do you convert improper fractions to mixed numbers?

**Tip:** When adding or subtracting fractions, always look for the least common denominator to make calculations easier.

Learn how to simplify the expression -3/4 and 2/5 by finding a common denominator, rewriting the fractions, and combining them. The result is -7/20, and this guide provides a step-by-step approach. Suitable for Grades 5-7 students.

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