A=matrix([[1,0,1],[1,1,0],[1,1,1]])
print A
B=vector([4,3,6])
print B
X=A.solve_right(B)
print X
A=matrix([[0,1,1],[1,0,1],[1,1,0]])
print A
B=vector([0,0,6])
print B
X=A.solve_right(B)
print X