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\eqalign{   & \left\{ \matrix{   x - 2y =  - 1 \cr   2x + 3y = 12 \cr}  \right.  \cr   & \left\{ \matrix{   x = 2y - 1 \cr   2x + 3y = 12 \cr}  \right.  \cr   & \left\{ \matrix{   x = 2y - 1 \cr   2\left( {2y - 1} \right) + 3y = 12 \cr}  \right.  \cr   & \left\{ \matrix{   x = 2y - 1 \cr   4y - 2 + 3y = 12 \cr}  \right.  \cr   & \left\{ \matrix{   x = 2y - 1 \cr   7y = 14 \cr}  \right.  \cr   & \left\{ \matrix{   x = 2y - 1 \cr   y = 2 \cr}  \right.  \cr   & \left\{ \matrix{   x = 3 \cr   y = 2 \cr}  \right. \cr} \eqalign{   & \left\{ \matrix{   x - 2y =  - 1 \cr   2x + 3y = 12 \cr}  \right.  \cr   & \left\{ \matrix{   2x - 4y =  - 2 \cr   2x + 3y = 12 \cr}  \right.  \cr   & \left\{ \matrix{    - 7y =  - 14 \cr   2x + 3y = 12 \cr}  \right.  \cr   & \left\{ \matrix{   y = 2 \cr   2x + 3y = 12 \cr}  \right.  \cr   & \left\{ \matrix{   y = 2 \cr   2x + 3 \cdot 2 = 12 \cr}  \right.  \cr   & \left\{ \matrix{   y = 2 \cr   2x = 6 \cr}  \right.  \cr   & \left\{ \matrix{   y = 2 \cr   x = 3 \cr}  \right. \cr}

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