X=30-27
X=3
y=20+8
y=28
X=64-64
X=0
1) x+27=30
x=30-27
x=3
2) y-8=20
y=20-8
y=2
3) 64-x=64
x=64-64
x=0
X=30-27
X=3
y=20+8
y=28
X=64-64
X=0
1) x+27=30
x=30-27
x=3
2) y-8=20
y=20-8
y=2
3) 64-x=64
x=64-64
x=0