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基础代数/有理表达式和方程/章节测试
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来自维基教科书，一个开放世界的开放书籍
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基础代数
请按如下方式发布您的测试问题
问题：（答案，难度级别（容易，中等，难））
示例 2x=6: （x=3，容易）
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书籍：基础代数
华夏公益教科书
