Tìm x, biết: \(\frac{5}{4} - 8x = \frac{7}\)

Đáp án đúng là: B

\(\frac{5}{4} - 8x = \frac{7}\)

\( - 8x = \frac{7} - \frac{5}{4}\)

\( - 8x = \frac{7} - \frac\)

\( - 8x = \frac{{ - 8}}\)

\(x = \frac{{ - 8}}:\left( { - 8} \right)\)

\(x = \frac{{ - 8}} \cdot \frac{{ - 1}}{8}\)

\(x = \frac{1}\). Vậy \(x = \frac{1}\)