3rd grade
5x3
15
15/3
5
5-x=-20
-25
15% of 80
12
6x=24
4
5x4
20
18/2
9
2+x=44
42
20% of 90
18
(x+3)(x+5)
x^2+8x+15
10x3
30
30/15
2
24+x=73
49
30% of 10
3
2x=20
10
6x4
24
64/4
16
57+x=99
42
17% of 50
8.5
6x-3=3
1
8x8
64
78/6
13
100-x=56
44
18% of 90
16.2
4x+15=31
4