การลบ 7 (-10+5-2)

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0
587878
0
60
block

28-7-7-7=?

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587879
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60
none
587880
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60
none
587882
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60
none
587883
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60
none
587884
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60
none
587885
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60
none
587886
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60
none
587887
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60
none
587888
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60
none