20240060010

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ada
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20240060010

Post by ada » Mon Feb 05, 2018 9:38 pm

$\begin{align}3a-b+2c-d&=18\\7a+b+3c+2d&=54\\2a+b+8c+6d&=57\\4a-b-3c+d&=7\end{align}$

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