Tìm x -1/10+2/5x +7/20=1/10

* Hướng dẫn giải

$\frac{-1}{10}+\frac{2}{5}x+\frac{7}{20}=\frac{1}{10}$

$\frac{2}{5}x=\frac{1}{10}-\frac{7}{20}+\frac{1}{10}$

$\begin{array}{l}\frac{2}{5}x=-\frac{3}{20}\\ x=-\frac{3}{8}\end{array}$