-1+2-3x4-5+6-7+8
(3x5)-(8+2)
5-2x2/4
1-2+3x4+5-6+7-8
10/5-1
3x5-8+1
10/(5-1x4)
17-3x(5-2)
10
4
6
-9
5
9
8
1
