\[ (a - 2d) + (a + 2d) = 2a = 20 \Rightarrow a = 10. \] - AMAZONAWS 📅 March 11, 2026 👤 scraface Mar 11, 2026
![\[ (a - 2d) + (a + 2d) = 2a = 20 \Rightarrow a = 10. \]](https://soloferat.biz.id/images/-a---2d--a--2d--2a--20-rightarrow-a--10-.jpg)
