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hoadalat9
2 năm trước
tìm x $\frac{2}{3}$ x +$\frac{5}{7}$ =$\frac{3}{10}$ $\frac{1}{2}$ - $\frac{3}{4}$ x =$\frac{3}{7}$ giúp mình với, mình đang cần gấp
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