What would an "explanation" be? An explanation with lower Kolmogorov complexity than the operation itself. That system of equations is probably all the "reason" you're going to get, since it's hard to get simpler than that.
If you're looking for something more humanly profound, how about this: "Arbitrary operations on integers can yield arbitrary results." That's actually profound (in the Zen-like way a tautology can still be profound) in the context of "human understanding" and how people argue with numbers, but it would take a long time to explain why, if you don't already know.
If you're looking for something more humanly profound, how about this: "Arbitrary operations on integers can yield arbitrary results." That's actually profound (in the Zen-like way a tautology can still be profound) in the context of "human understanding" and how people argue with numbers, but it would take a long time to explain why, if you don't already know.