(12 : 3 + 4) * 5 = 40
((1 + 5) * (3 + 4)) - 2 = 40
(1 - 2 + 3) * 4 * 5 = 40
(- 1 + 2 + 3 + 4) * 5 = 40
(12 : 3 + 4) * 5 = 40
((1 + 5) * (3 + 4)) - 2 = 40
(1 - 2 + 3) * 4 * 5 = 40
(- 1 + 2 + 3 + 4) * 5 = 40