1/2+5/3+1,5;1,3-1/2=
=5/3+1,5:1,3=
=5/3+3/2+1,3=
=5/3+3/2:13/10=
=5/3+3/2×10/13=
=5/3+3×5/13=
=5/3+15/13=
=110/39.