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| 1. |
\left. \begin{array} { l } { 2 x + 3 y - 4 = 0 \text { and } 2 x + 3 y + 17 = 0 } \\ { 9 x + 40 y - 20 = 0 \text { and } 9 x + 40 y + 103 = 0 } \end{array} \right. |
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