-5.7+(-13.3)-(-6.3)-1.3
-5.7+(-13.3)-(-6.3)-1.3= -19-12.7-1.3=-14
-5.7+(-13.3)-(-6.3)-1.3=
=-5,7-13,3+6,3-1,3=
=-20,3+6,3=
=-14