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X^X+X^X=839 what is x?

y=6(x+2) what is x? just joking this is

<span style="background-color: #FFFF00; color: #000000; font-weight: bold"><font color=yellow>If you mean the square of a whole number, there is no solution. The only squares of whole numbers that differ by 5 are 2^2 =4 and 3^2 = 9. If you remove the restriction that it must be squares of whole numbers, there is an infinite number of solutions, since every positive number is the square of something (namely, the square root of that number). If you also allow complex numbers, even negative numbers are squares. In that case 9 = 3^2, 4 = 2^2, -1 = i^2 where i is the imaginary number representing the square root of -1.</font color=yellow></span hi>

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Q: What is the hardest math question in the world?
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