Tìm \(x\) biết: \(\frac{7}{8} + x = \frac{3}{5}\)

* Hướng dẫn giải

\(\frac{7}{8} + x = \frac{3}{5}\)

\(\begin{array}{l}\frac{7}{8} + x = \frac{3}{5}\\\,\,\,\,\,\,\,\,x = \frac{3}{5} - \frac{7}{8}\\\,\,\,\,\,\,\,\,x = \frac{{24}}{{40}} - \frac{{35}}{{40}}\\\,\,\,\,\,\,\,\,x = \frac{{ - 11}}{{40}}\end{array}\)

Vậy \(x = \frac{{ - 11}}{{40}}\).