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  1. Quadratic Equations: Very Difficult Problems with Solutions

  2. 10 Math Equations That Have Never Been Solved - Interactive ...

  3. These Are the 10 Hardest Math Problems Ever Solved

  4. 7 of the hardest problems in mathematics that have been solved

  5. Hardest Math Problem Solved | Diophantine Equation Answers

  6. 7 of the hardest math problem in the world yet to be solved

  7. The fascination and complexity of the world’s hardest math ...