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  • 4.17: Complex Rational Expressions
    https://math.libretexts.org/Courses/Las_Positas_College/Foundational_Mathematics/04%3A_Fractions/4.17%3A_Complex_Rational_Expressions
    \(\begin{aligned} \frac{1-\frac{4}{x}-\frac{21}{x^{2}}}{1-\frac{2}{x}-\frac{15}{x^{2}}} &=\frac{\frac{1}{1} \cdot \color{Cerulean}{\frac{x^{2}}{x^{2}}}\color{black}{-\frac{4}{x} \cdot}\color{Cerulean}...\(\begin{aligned} \frac{1-\frac{4}{x}-\frac{21}{x^{2}}}{1-\frac{2}{x}-\frac{15}{x^{2}}} &=\frac{\frac{1}{1} \cdot \color{Cerulean}{\frac{x^{2}}{x^{2}}}\color{black}{-\frac{4}{x} \cdot}\color{Cerulean}{ \frac{x}{x}}\color{black}{-\frac{21}{x^{2}}}}{\frac{1}{1} \cdot \color{Cerulean}{\frac{x^{2}}{x^{2}}}\color{black}{-\frac{2}{x} \cdot}\color{Cerulean}{ \frac{x}{x}}\color{black}{-\frac{15}{x^{2}}}} \\ &=\frac{\frac{x^{2}}{x^{2}}-\frac{4 x}{x^{2}}-\frac{21}{x^{2}}}{\frac{x^{2}}{x^{2}}-\frac{2 x}{x…

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