If x and y are different integers, both divisible by 6, then…

If x and y are different integers, both divisible by 6, then which is not necessarily true?

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #8602