1 + 2 + 3 - 4 = 2;
(1 + 2 + 3 + 4) : 5 = 2;
1 + (2 • 3 - 4) + 5 - 6 = 2;
(1 + (2 • 3 - 4) + 5 + 6) : 7 = 2
1 + 2 + 3 - 4 = 2;
(1 + 2 + 3 + 4) : 5 = 2;
1 + (2 • 3 - 4) + 5 - 6 = 2;
(1 + (2 • 3 - 4) + 5 + 6) : 7 = 2