Find an exact expression for $\displaystyle {y}$ in terms of $\displaystyle {x},\angle{B},\angle{C}$ given that $\displaystyle \angle{A}={30}^{\circ}$ and $\displaystyle \angle{D}={60}^{\circ}$. Be sure to simplify completely (including rationalized denominators). 

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 $\displaystyle {y}=$

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