If the average (arithmetic mean) of x + 1, x + 4…

If the average (arithmetic mean) of x + 1, x + 4, and x + 7 is 0, then x =

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 #45508