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Solve the following system of equations: \[\begin{cases} 2x+y=7 \\ 4x-y=5. \end{cases}\]

Solve the following system of equations: \[\begin{cases} -3x+4y=29 \\ -7x-4y=1. \end{cases}\]

Solve the following system of equations: \[\begin{cases} 6x+2y=42 \\ 8x-4y=36. \end{cases}\]

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