Problem:
Solve the following system of three equations: 
$-8 x-7 y+16 z+21=0$, $12 y+11 z+12=0$, $2 x-8 y+11 z-6=0$
Answer:
$x=\frac{937}{383}$, $y=-\frac{251}{383}$, $z=-\frac{144}{383}$
{'source': 'AMPS', 'file': 'amps/mathematica/algebra/system_of_equations/35385.txt'}