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\left. \begin{array} { l l } { \frac { 1 } { 2 ( 2 x + 3 y ) } + \frac { 12 } { 7 ( 3 x - 2 y ) } = \frac { 1 } { 2 } , } & { \frac { 7 } { ( 2 x + 3 y ) } + \frac { 4 } { ( 3 x - 2 y ) } = 2 } \\ { \text { where } ( 2 x + 3 y ) \neq 0 \text { and } ( 3 x - 2 y ) \neq 0 } \end{array} \right.

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