https://adamaths.com/forum/
20240030010
https://adamaths.com/forum/viewtopic.php?f=117&t=5814
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20240030010
Posted:
Mon Feb 05, 2018 9:30 pm
by
ada
$\begin{align}x+y+z&=11\\x+y-z&=9\\2x+y-z&=14\end{align}$