x-numărul
x-x/6-1=y
y-y/9-4=z
z-z/7-6=a
a-a/3-2=b
b-b/2-20=1
b-b/2-20=1
b-b/2=21
2b/2-b/2=21
b/2=21
b=42
a-a/3-2=42
a-a/3=44
3a/3-a/3=44
2a/3=44
2a=132
a=66
z-z/7-6=66
z-z/7=72
7z/7-z/7=72
6z/7=72
6z=504
z=84
y-y/9-4=84
y-y/9=88
9y/9-y/9=88
8y/9=88
8y=792
y=99
x-x/6-1=99
x-x/6=100
6x/6-x/6=100
5x/6=100
5x=600
x=120