TeX джерело:

X\;=\;\left(\begin{array}{rrr}-2&-4&3\\-4&-7&5\\ -5&-8&6 \end{array}\right)\left(\begin{array}{c}5\\0\\ -1 \end{array}\right)=\left(\begin{array}{c}-13\\-25\\ -31 \end{array}\right).