1 * 2 + 3 + 4 + 5 + 6 + 7 - 8 - 9 =10
1 * 2 = 2
2 + 3 = 5
5 + 4 = 9
9 + 5 = 14
14 + 6 = 20
20 + 7 = 27
27 - 8 = 19
19 - 9 = 10
1 * 2 + 3 + 4 + 5 + 6 + 7 - 8 - 9 =10
1 * 2 = 2
2 + 3 = 5
5 + 4 = 9
9 + 5 = 14
14 + 6 = 20
20 + 7 = 27
27 - 8 = 19
19 - 9 = 10