Question

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

Answer 1

boa tarde! 53-{20-[30-(15-1+6)+2]}
                 53-{20-[30-20+2]}
                 53-{20-12}
                 53-8
                 45
espero ter te ajudado  

Answer 2

Irá ser:
53-{20-[30-(15-1+6)+2]}
53-{20-[30-20+2]}
53-{20-12}
53-8
45.