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  1. 10 Math Equations That Have Never Been Solved

  2. Quadratic Equations: Very Difficult Problems with Solutions

  3. Q: What is the most complicated equation? - Ask a …

  4. The 11 most beautiful mathematical equations | Live Science

  5. The 3 Most Complicated Equations That Exist - Medium

  6. These Are the 10 Hardest Math Problems Ever Solved - Popular Mechanics

  7. List of unsolved problems in mathematics - Wikipedia

  8. After cracking the “sum of cubes” puzzle for 42 ... - MIT News

  9. Hardest Math Problem Solved | Diophantine Equation Answers

  10. Euler’s Identity: 'The Most Beautiful Equation' - Live Science