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20240020020
https://www.adamaths.com/forum/viewtopic.php?f=117&t=5813
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20240020020
Posted:
Mon Feb 05, 2018 9:30 pm
by
ada
$\begin{align}5s-t+3u&=52\\s+t+u&=20\\4s-2t+u&=29\end{align}$