30-10
20
10-1
=9
26-1
=25
what is 10+19
=29
20-20
=0
22-3
=19
60-20
=40
what is 9+20
40-30
10
48-8
100-80
=20
50+30
=80
33-10
23
34-4
=30
95-18
=77
10+23
=33
80-50
30
39-9
50-50
40+56
=96
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