A = 1 + 2 + 3 + 4 – 5 – 6 A = 1 + 2 + 3 + 4 – 5 – 6

A = 1 + 2 + 3 + 4 – 5 – 6 A = 1 + 2 + 3 + 4 – 5 – 6