90 - ( 15 + 9) : 8 = 87
15 + 9 = 24
24 : 8 = 3
90 - 3 = 87
18 + 9 ( 13 - 7 ) = 72
13 - 7 = 6
9 * 6 = 54
18 + 54 = 72
64 - ( 28 + 4 ) : 4= 56
28 + 4 = 32
32 : 4 = 8
64 - 8 = 56
72 : 9 + 2 * 7 = 22
72 : 9 = 8
2 * 7 = 14
8 + 14 = 22
9 * 6 - 30 : 3 = 44
30 : 3 = 10
54 - 10 = 44
28 : 7 + 5 * 6 = 34
28 : 7 = 4
5 * 6 = 30
4 + 30 = 34
90 - ( 15 + 9) : 8 = 87
15 + 9 = 24
24 : 8 = 3
90 - 3 = 87
18 + 9 ( 13 - 7 ) = 72
13 - 7 = 6
9 * 6 = 54
18 + 54 = 72
64 - ( 28 + 4 ) : 4= 56
28 + 4 = 32
32 : 4 = 8
64 - 8 = 56
72 : 9 + 2 * 7 = 22
72 : 9 = 8
2 * 7 = 14
8 + 14 = 22
9 * 6 - 30 : 3 = 44
9 * 6 = 54
30 : 3 = 10
54 - 10 = 44
28 : 7 + 5 * 6 = 34
28 : 7 = 4
5 * 6 = 30
4 + 30 = 34