Tìm y biết: 7/4 - y(5/6) = 1/2 +1/3

\(\frac{7}{4} - y \times \frac{5}{6} = \frac{1}{2} + \frac{1}{3}\)

⇔ \(\frac{7}{4} - y \times \frac{5}{6} = \frac{5}{6}\)

⇔ \(y \times \frac{5}{6} = \frac{7}{4} - \frac{5}{6}\)

⇔ \(y \times \frac{5}{6} = \frac{{22}}{{24}}\)

⇔ \(y = \frac{{22}}{{24}}:\frac{5}{6}\)

⇔ \(y = \frac{{11}}{{10}}\)

Vậy \(y = \frac{{11}}{{10}}\).