float give me the answer "-0"

[stereoMatching]

As the title state
I am using the openCV library to solve some equations

Mat_<float> const RIGHT = (Mat_<float>(3, 1) << -1, -1, -1 );
Mat_<float> const LEFT =  (Mat_<float>(3, 3) << 660.219, 1678.75, 1,
                                                                    710.887, -399.216, 1,
                                                                    -3512.95, 420.678, 1);
Mat_<float> dst(3, 1);
cv::solve(LEFT, RIGHT, dst);

this means I am solving some equations by the way of linear algebra
LEFT * dst = RIGHT
the answer would save in the dst, but dst give me "-0"
What it that mean?
Thanks a lot

[hamsterman]

Thats just 0.