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dietrich_harmon
Solve the proportion.
2=3-1 or 2=(sqrt(3)+1)(sqrt(3)-1) thus 2/x =(sqrt(3)+1)/5 or (sqrt(3)+1)(sqrt(3)-1)=(sqrt(3)+1)/5 or(sqrt(3)-1)/x=1/5 or x=5(sqrt(3)-1)
\[10=x(\sqrt{3}+1)\] \[x=\frac{ 10 }{ \sqrt{3}+1}=\frac{ 10 }{ \sqrt{3}+1}*\frac{ \sqrt{3}-1 }{ \sqrt{3}-1}=-5+5\sqrt{3}\]