Cách làm cho bạn:
a) x+$\frac{3}{7}=\frac{2}{5}$ => x=$\frac{2}{5}−\frac{3}{7}=−\frac{1}{35}$
b) $\frac{3}{2}−x=\frac{4}{5}$ =>x=$\frac{7}{10}$
c) $\frac{5}{9}−\frac{1}{3}x=\frac{2}{3}$ => x=$\frac{−1}{3}$
d) $\frac{3}{5}x−1\frac{1}{5}=\frac{-3}{14}:\frac{5}{7}$ => $\frac{3}{5}x−\frac{6}{5}=\frac{−3}{10} nên x=\frac{3}{2}$
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