2 x 7 - 3
(3 + 5) / 2
9
2 x 3 - 1
5
4
15
3 x 14 / 2
16
2 x (8 - 3)
(9 - 3) / 2 =
3
8 / 2 x 3
11
2 x (3 + 5)
7 + 2 x 4
10
12
3 x 6 / 2
21