Tìm x: 3/4 - x = 1/2 x = 3/4 - 1/2 x = 3/4 - 2/4 x = 1/4

* Hướng dẫn giải

$\begin{array}{l}\frac{3}{4}-x=\frac{1}{2}\\ x=\frac{3}{4}-\frac{1}{2}\\ x=\frac{3}{4}-\frac{2}{4}\\ x=\frac{1}{4}\end{array}$