## Elementary Algebra

We follow order of operations, so we first consider everything inside of the brackets, then we multiply, and then we add/subtract everything else: $-9-2[4-(-10+6)]-1$ =$-9-2[4-(-4)]-1$ =$-9-2[4+4]-1$ =$-9-2(8)-1$ =$-9-16-1$ =$-25-1$ =$-26$