Question

{-13+[-6+(-9+6)-7]}

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Answer 1

$- 29$

${- 13 + [ - 6 + ( - 9 + 6) - 7]$

$- 13 + ( - 6 + ( - 3) - 7)$

$- 13 + ( - 6 - 3 - 7)$

$- 13 + ( - 16)$

$- 13 - 16$

$\rightarrow \boxed{ - 29}$

(espero ter colaborado)