Verified answer

[tex]\LARGE\tt{}\left(5 \times 1 \div 2 + 6\right) - \left(23 + 5 - 2\right) \\ \\\LARGE\tt{}\left(2,5 + 6\right) - 26 \\ \LARGE\tt{}8,5 - 26 \\ \LARGE\tt{} \boxed{ - 17,5}[/tex]

[tex]{\large\boxed{\boxed{  { \large \tt Bons~Estudos }}}}[/tex]