According to the order of operations which step should be completed first in the following expression: 6-3 x 1 x 1 x 1 x 1 x 1 x 1 x 1 x 1x 1 x1 x1 x 1 x 1 x 1 x1 x 1 x 1 x1 / 2 x 4 + 8.