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radical x + radical 2x =1
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\[=\sqrt{x}+\sqrt{2x}=1\]
\[\sqrt{x}*(1+\sqrt{2})=1\]
\[\sqrt{x}=1/(1+\sqrt{2})\] square both side - you get answer for x
\[x=1/(1+\sqrt{2})^{2}\]
so you can't combine \[\sqrt{x}\] and \[\sqrt{2x}\]
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