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``` * **Reasoning:** Includes key identifiers (GATE, Civil, 2023, Set 2, Q9), indicates it's a "Solution," specifies the mathematical concept (Exponential Equation), and includes the exact equation for direct search matching. **2. Meta Description (Max ~160 characters):** ```html ``` * **Reasoning:** Expands on the title, mentions the problem's context and type, highlights the mathematical topics involved (exponents, logarithms), and adds a call to action/benefit for users (practice, detailed answers, previous year questions). **3. Meta Keywords (Comma-separated list):** ```html ``` * **Reasoning:** Combines broad search terms (GATE Civil Engineering, exam preparation) with specific details (2023, Set 2, Question 9, the equation itself) and relevant mathematical concepts (exponential equation, logarithms, exponents). **4. H1 Tag (Main Heading on the Page):** ```html
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