[tex] - 1 + 2 \times ( - 3 + 4 \times ( - 5 + 6) = \\ - 1 + 2 \times ( - 3 + 4 + 1) = \\ - 1 + 2 \times (1 + 1) = \\ - 1 + 2 \times 2 = \\ - 1 + 4 = \\ 3[/tex]
