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K = D + 3 where the letters represent the number of problems solved by Ki and Daniel respectively.
By virtue of being presently unsolved, the remaining Millennium Prize Problems appear to be the most difficult. source: [See related link below for the most difficult problems. These problems have not been solved even by the most experienced mathmeticians today.
It may be possible to solve equations. Expressions cannot be solved until they are converted, with additional information, into equations or inequalities which may have solutions.
9x+3x2=14+x-1 AND 2x2+x2+x=30
ill-structured problems