12-10=2
72+32=104+92=196
92-72=20 39-20=19
10+92=102. 102+72=174 102+2201=2603 1000-9=1991-22=1969
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12-10=2
72+32=104+92=196
92-72=20 39-20=19
10+92=102. 102+72=174 102+2201=2603 1000-9=1991-22=1969