Question 914871
12-{7-[9-(5-11+8)-(4+5)]-12}
 =12-{7-[9-(2)-(9)]-12}
 =12-{7-[9-2-9]-12}
 =12-{7-[-2]-12}
 =12-{7+2-12}
 =12-{-3}
 =12+3
=15
result =15