Tìm x, biết: x-5/7=1/9

* Hướng dẫn giải

$$\begin{gathered} a)x=\frac{1}{9}+\frac{5}{7}=\frac{52}{63} \\ b)x=\frac{2}{15}-\frac{3}{10}=\frac{-1}{6} \end{gathered}$$

$\begin{array}{l}c)x=\frac{2}{45}-\frac{1}{9}=\frac{-1}{15};\\ \\ d)x=\frac{-3}{7}-\frac{4}{5}-\frac{-2}{3}=\frac{-59}{105}\end{array}$