(-18+83+11,4) + (-12, 3+19.73)=83,83
1) -18+83=65
2) 65+11,4=76,4
3)-12,3+19,73=7,43
4)76,4+7,43=83,83
(-18+83+11,4) + (-12, 3+19.73)=83,83
1) -18+83=65
2) 65+11,4=76,4
3)-12,3+19,73=7,43
4)76,4+7,43=83,83