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$\dfrac { 4 } { x } - \dfrac { 1 } { y } = \dfrac { 7 } { 2 }$
$\dfrac { 3 } { x } - \dfrac { 1 } { 2 y } = \dfrac { 15 } { 4 }$
$\begin{cases} \dfrac{ 4 }{ x } - \dfrac{ 1 }{ y } = \dfrac{ 7 }{ 2 } \\ \dfrac{ 3 }{ x } - \dfrac{ 1 }{ 2y } = \dfrac{ 15 }{ 4 } \end{cases}$
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