X * 57 = 0
X = 0 : 57
X = 0
----------------
789 * X = 0
X = 0 : 789
X = 0
--------------------
12 : X = 12
X = 12 : 12
X = 1
----------------------
X : 697 = 0
X = 0 * 697
X = 0
-------------------------
X * 14 = 14
X = 14 : 14
X = 1
----------------------------
45 : X = 1
X = 45 : 1
X = 45