x2-
6x5
9-
1
(
20x5+
20)
:
42
8-
9x4
(
5x7+
12)
:
6
x2-
4
7-
9:
8
4-
5x5
8:
3x8+
7x3
(
4-
5)
x2
13-
12+
8
(
3-
6)
9
x4:
5+
20
(
15-
7x3)
6
7-
30
(
8-
3x4)
3x5
20+
15
30:
3x8
10-
4x6
24:
x4
15-
9
(
8x5+
7)
x3
21-
5
(
2-
9)
6
6:
x3
3-
9
(
6x5-
15)
13
4x4:
11
20-
5
6x3-
4x3
