Tìm x biết x-7/4=3/16

a) \(x - \frac{7}{4} = \frac{3}{{16}}\)

\(x = \frac{3}{{16}} + \frac{7}{4}\)

\(x = \frac{3}{{16}} + \frac{{28}}{{16}}\)

\(x = \frac{{31}}{{16}}\).

Vậy \(x = \frac{{31}}{{16}}\).

b) \(\left( {5x - \frac{4}{9}} \right) \cdot \frac{8}{{27}} = \frac{8}{3}\)

\(5x - \frac{4}{9} = \frac{8}{3}:\frac{8}{{27}}\)

\(5x - \frac{4}{9} = \frac{8}{3} \cdot \frac{{27}}{8}\)

\(5x - \frac{4}{9} = 9\)

\(5x = 9 + \frac{4}{9}\)

\(5x = \frac{{85}}{9}\)

\(x = \frac{{85}}{9}:5\)

\(x = \frac{{17}}{9}\)

Vậy \(x = \frac{{17}}{9}\).