Answer :

[tex]2=x^2-10x\\ x^2-10x-2=0\\ x^2-10x+25-27=0\\ (x-5)^2=27\\ x-2=-\sqrt{27} \vee x-2=\sqrt{27}\\ x=2-3\sqrt{3} \vee x=2+3\sqrt{3}[/tex]

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