12 - 24/(16-8) = 12 - 24/8 = 12 - 3 = 9
(5+4) x 9 : 3 x 3
9 x 3 x 3 = 81
20 : (20 : (10:2))
20 : (20 : 5)
20 : 4
5
(6-4) x (15 - (6+5))
2 x (15 - 11)
2 x 4
8
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12 - 24/(16-8) = 12 - 24/8 = 12 - 3 = 9
(5+4) x 9 : 3 x 3
9 x 3 x 3 = 81
20 : (20 : (10:2))
20 : (20 : 5)
20 : 4
5
(6-4) x (15 - (6+5))
2 x (15 - 11)
2 x 4
8