Tìm x: x + 5/7 = 3/2 x = 3/2 - 5/7 x = 21/14 - 10/14 x= 11/14

* Hướng dẫn giải

$\begin{array}{l}x+\frac{5}{7}=\frac{3}{2}\\ x=\frac{3}{2}-\frac{5}{7}\\ x=\frac{21}{14}-\frac{10}{14}\\ x=\frac{11}{14}\end{array}$