15 18 6 21 12 9 3 27 3 24 0
3
x
9
=
3
x
0
=
3
x
8
=
3
x
6
=
3
x
2
=
3
x
5
=
3
x
1
=
3
x
3
=
3
x
7
=
3
x
4
=
3
x
10
=