# Chapter 6 - Section 6.2 - Adding and Subtracting Rational Expressions - Exercise Set: 99

when the denominators are relatively prime

#### Work Step by Step

The $LCD$ of two rational expressions equal to the product of their denominators if the denominators are relatively prime. That is, there are no common factors between the two denominators, such as the denominators of the expressions $\dfrac{1}{x}$ and $\dfrac{7}{x+5}.$

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