Can't find my mistake trying to find the inverse:
2026-04-24 21:19:07.1777065547
Inverting $3 \times 3$ matrix via Gauss-Jordan, cannot find my mistake
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When you do $R_2 \to R_2-2R_3$ on the 2nd page, you get in the 1st column $\frac23-2\times\frac19=\frac13$, while it should be $\frac49$.