For any non-zero a and b that satisfy |ab| = ab and…

For any non-zero a and b that satisfy |ab| = ab and |a| = a |b - 4| + |ab - b| = ?

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 #9143