Question

-8+{-5+[(8-12)+(13+12)]-10}?????

Answer 1

-8+{-5+[(8-12)+(13+12)]-10}

-8+{-5+[-4 +25]-10}

-8+{-5+21-10}

-8+{-5+11}

-8 + 6

-2

Answer 2

-8+{-5+[-4+25]-10}
   -8+{-5+[21]-10}
     -8+{[16]-10}
          -8+{6}
          -8+6
            -2