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- $\left({{{x}{+}{2}{a}}}\right)\left({{{x}{-}{1}}}\right)$
- $\left({{{x}{-}{2}{a}}}\right)\left({{{x}{+}{1}}}\right)$
- ${{{(}{x}{+}{2}{a}{)}}}\left({{{x}{+}{1}}}\right)$
- $\left({{{x}{-}{2}{a}}}\right)\left({{{x}{-}{1}}}\right)$