8+ =35-20
9+ =57-40
6+ =24-10
18- =29-20
12- =60-56
11- =95-90
-8=36-30
-7=49-43
-5=18-9

1)8+_= 35-20
35-30=15
15-8=7

2)9+_=57-40
57-40=17
17-9=8

3)6+_=24-10
24-10=14
14-6=8

4)18-_=29-20
29-20=9
18-9=9

5)12-_=60-56
60-56=4
12-4=8

6)11-_=95-90
95-90=5
11-5=6

7)_-8=36-30
36-30=6
8+6=14

8)_-7=49-43
49-43=6
6+7=13

9)_-5=18-9
18-9=9
9+5=14