Spočtěte neznámou y ze soustavy rovnic \begin{array}{rrrrr} x & +6y & -...
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Spočtěte neznámou 
y ze soustavy rovnic 
\begin{array}{rrrrr} x & +6y & -6z & = & -9 \\-8x & -7y & -5z & = & 2 \\-5x & -7y & +5z & = & 1 \end{array}
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