Problem:
Solve the following system of three equations: 
$19 x-23 y-17 z+21=0$, $-22 x-18 y+3 z-4=0$, $-17 x-14 y-3 z+20=0$
Answer:
$x=\frac{6160}{4481}$, $y=-\frac{5267}{4481}$, $z=\frac{19546}{4481}$
{'source': 'AMPS', 'file': 'amps/mathematica/algebra/system_of_equations/46777.txt'}