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= 5/x² + x - 6 + 2x/x² + 2x - 3
= 5/x² + x³/x² - 6x²/x² + 2x/x² + 2x³/x² - 3x²/x²
= (x³ + 2x³ - 6x² - 3x² + 2x + 5)/x²
= (3x³ - 9x² + 2x + 5)/x²
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