66+77=
143
6-5=
55-4=
51
37+42=
79
100+200=
300
14-14=
0
93-8=
85
51+42=
93
32+12=
44
20-12=
8
70-6=
64
42+32=
74
631+121=
752
804-704=
100
57-40=
17
23+64=
87
254+120=
374
100-50=
50
92-75=
33+33=
66
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