-4.2+5.7-8.4+10.2=1.5-8.4+10.2=-6.9+10.2=3.3
-4.2+5.7-8.4+10.2=10.2-4.2-8.4+5.7=6+5.7-8.4=11.7-8.4=3.3
qnmd
