Question

3-{-5-[8-2+(-5+9)]}
ajudem

Answer 1

$- 5 + 9 = + 4$
$8 - 2 + 4 = 10$
$- 5 - 10 = - 15$
3+15 = 18

Answer 2

3-{-5-[8-2+(-5+9)]}
3-{-5-[8-2+4]}
3-{-5-10}
3-{-15}
3+15
18