Question

preciso q alguem saiba resolver a essa expressao numerica -{+15-[(-4+20)-20}-17}

Answer 1

-{+15-[(-4+20)-20}-17}=
-{+15-[+16-20]-17}=
-{+15-[-4]-17}=
-{+15+4-17}=
-{+19-17}=
-{+2}=
-2