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        <lastmod>2025-12-29T16:00:12.885004136Z</lastmod>
        
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            <Attribute name="title">Razonar con sistemas de ecuaciones</Attribute>
            <Attribute name="description">Determina qué manipulación se realizó en un sistema para obtener otro, y después determina si los sistemas son equivalentes.</Attribute>
            <Attribute name="author">Tomer Gal</Attribute>
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