## Math Problem Statement

-4/5-7/8

## Solution

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## Math Problem Analysis

### Mathematical Concepts

Fractions

Subtraction of Fractions

Least Common Denominator (LCD)

Improper Fractions

### Formulas

To subtract fractions: a/b - c/d = (ad - bc) / bd

Finding the least common denominator (LCD) between two fractions

Converting fractions to a common denominator

### Theorems

Fraction Subtraction Theorem

Least Common Denominator

### Suitable Grade Level

Grades 6-8