849 second challenge

x2+y2=849x2y2{x}^{2}+{y}^{2}=849-{x}^{2}{y}^{2}

Find all possible xx values to the equation above such that xx and yy are both positive integers. And state the values of xx in ascending order with no spaces in between (e.g. if the solutions were 22, 5555 and 1313 you would write "2135521355").

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