Solve for x: (1/3)(x+3)=-(x-1)

When you answer this can you explain

Which coefficient matrix represents a system of linear equations that has a unique solution ? options in photo*

Of to(3, 4) (2,1) (3,7) (5,2) (5,-2) (3, 3) (-2, 3) (1,2) (-4,-2) (-3, 1) (4, -1) (-1, 1) 10 v 29