Question

calcule : 15-[3+(9-13-18)]

Answer 1

15-[3+(-22)]
15-(-19)
15+19
34

Answer 2

$15-[3+(9-13-18)] =$
$15 - [3+ (-4-18)] =$
$15 - [ 3 + (-22) ] =$
$15 - (-19 ) =$
$= 34$