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phuonganh3062002
2 năm trước
a 3 x X +20 = X +200 b 5 x X +10 = 2 x X +40 c 90 x X +2 = 10 x X +82 d 100 x X + 15 = X +195 đ 5 x X + 2 x X - 3 x X +20 = 100
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