z=8-3.8
z=4.2
y=12+6.5
y=18.5
-x=1.8-13.5
x=11.7
r=15.4-15.4
r=0
l=12.5-6.5
l=6
5.6-r=4.4-3.8
5.6-r=0.6
-r=5.6-0.6
r=5