Turn which way?

Algebra Level 2

\[ \begin{eqnarray} \LARGE \color{brown}x + \frac {\color{blue} 4} {\color{purple}y} &=& \LARGE {\color{blue} 4} \\ \LARGE \color{purple}y + \frac {\color{green} 6}{ \color{brown} x } &=& \LARGE {\color{green} 6} \\ \LARGE \color{brown}x + \color{purple}y \ &=& \LARGE \ \color{grey} ? \end{eqnarray} \]

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