{2x−3y=6 4x+3y=12\left\{\begin{array}{l}2 x-3 y=6 \ 4 x+3 y=12\end{array}\right.{2x−3y=6 4x+3y=12
{2x+3y=6 4x−3y=12\left\{\begin{array}{l}2 x+3 y=6 \ 4 x-3 y=12\end{array}\right.{2x+3y=6 4x−3y=12
{3x+2y=6 −3x+4y=12\left\{\begin{array}{c}3 x+2 y=6 \ -3 x+4 y=12\end{array}\right.{3x+2y=6 −3x+4y=12
{−3x+2y=6 3x+4y=12\left\{\begin{array}{l}-3 x+2 y=6 \ 3 x+4 y=12\end{array}\right.{−3x+2y=6 3x+4y=12
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