Question

53-{20+[30-(15-1)+6+2]}

Answer 1

53-{20+[30-(14)+8]}
53-{20+[24]}
53-{44}
9
eacolhe como melhor resposta :)

Answer 2

53-{20+[30-(14)+6+2]}
53-{20+[30-14+6+2]}
53-{20+[16+8]}
53-{20+[24]}
53-{20+24}
53-{44}
53-44
9