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penjumlahan dan pengurangan
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34-11
23
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60-48
12
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124-23
121
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123-111
12
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21-12
9
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88-12
76
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Okay!
Oops!
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67+94
161
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Okay!
14+14
28
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92+12
104
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44+34
78
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71-54
17
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12+13
25
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92-77
15
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25+33
58
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61+60
121
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44-44
0
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19+33
52
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56+11
67
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56-40
16
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77+12
89
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