As a software developer building an educational math app, you are writing the logic to automatically simplify complex rational expressions using the LCD method. When your program processes the expression $\frac{\frac{2}{x-7}-\frac{1}{x+7}}{\frac{6}{x+7}-\frac{1}{x^2-49}}$, it first needs to identify the Least Common Denominator (LCD) of all the inner fractions. What should your program identify as the LCD?

You are a quality assurance specialist for an educational software company. You are verifying the logic of a calculation engine that simplifies complex rational expressions. For the expression $\frac{\frac{2}{x-7}-\frac{1}{x+7}}{\frac{6}{x+7}-\frac{1}{x^2-49}}$, arrange the following steps in the correct order as prescribed by the LCD method described in your documentation.

Imagine you are a quality assurance specialist for an educational software company. You are verifying the step-by-step solution for simplifying the expression $\frac{\frac{2}{x-7}-\frac{1}{x+7}}{\frac{6}{x+7}-\frac{1}{x^2-49}}$. The Least Common Denominator (LCD) has been correctly identified as $(x-7)(x+7)$. Match each internal fraction from the original expression with the simplified form it takes after the numerator and denominator of the main fraction are multiplied by the LCD and common factors are canceled.

Imagine you are a mathematics content auditor reviewing a solution key for the complex rational expression $\frac{\frac{2}{x-7}-\frac{1}{x+7}}{\frac{6}{x+7}-\frac{1}{x^2-49}}$. According to the LCD method, the denominator of the expression simplifies to ${}6x - 43$.

Logistics Efficiency Formula: Numerator Simplification