Question

-10 -[-2+[+1-(-3-5)+3]]

Answer 1

-10-{-2+[1-(-3-5)+3]}

-10-{-2+[1-(-8)+3]}

-10-{-2+[1+8+3]}

-10-{-2+[12]}

-10-{-2+12}

-10-{10}

-10-10

-20

Answer 2

-10-[-2+[+1-(-3-5)+3]]
 -10-[-2+[+1-(-8)+3]]
    -10+2+[+9+3]]
      -8+[+12]
          +4