Using BODMAS
34 - [29 - {30 + 66 **÷** (24 - bar 28 - 26)}]
= 34 – [29 – {30 + 66 + (24 – 2)}]
= 34 – [29 – {30 + 66 + 22}]
= 34 – [29 – {30 + 3}]
= 34 – [29 – 33]
= 34 – [-4]
= 34 + 4
= 38