Tìm x , biết rằng 3) − 2 x − 2/ 3 ( 3 /4 − 1/ 8 x ) = ( − 1 /2 )^ 3

3) \( - 2x - \frac{2}{3}\left( {\frac{3}{4} - \frac{1}{8}x} \right) = {\left( { - \frac{1}{2}} \right)^3}\)

\( - 2x - \frac{1}{2} + \frac{1}{{12}}x = \frac{{ - 1}}{8}\)

\(\frac{{ - 23}}{{12}}x = \frac{{ - 1}}{8} + \frac{1}{2}\)

\(\frac{{ - 23}}{{12}}x = \frac{3}{8}\)

\(x = \frac{3}{8}:\frac{{ - 23}}{{12}}\)

\(x = \frac{{ - 9}}{{46}}\).

Vậy \(x = \frac{{ - 9}}{{46}}\).