>>> """
5x+2y+9z=8
2x-5y+z=0
x-y+z=3
"""
'\n5x+2y+9z=8\n2x-5y+z=0\nx-y+z=3\n'
>>> from sympy import Matrix
>>> A = Matrix([[5,2,9], [2,-5,1],[1,-1,1]])
>>> B = Matrix([[8],[0],[3]])
>>> A.inv()*B
[109/5]
[ 31/5]
[-63/5]
>>>