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(Solved): Solve the system by substitution. \[ \begin{array}{c} x+7 y=-42 \\ 4 x+7 y=-63 \end{array} \] ...



Solve the system by substitution. \[ \begin{array}{c} x+7 y=-42 \\ 4 x+7 y=-63 \end{array} \]
Solve the system by substitution. \[ \begin{array}{c} x+7 y=-42 \\ 4 x+7 y=-63 \end{array} \]


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