40%x - x - \(\dfrac{1}{8}=\dfrac{3}{4}\)
\(\dfrac{2}{5}\)x - x = \(\dfrac{3}{4}+\dfrac{1}{8}\)
x .\(\left(\dfrac{2}{5}-1\right)\) = \(\dfrac{6}{8}+\dfrac{1}{8}\)
x. \(\left(\dfrac{2}{5}-\dfrac{5}{5}\right)\) = \(\dfrac{7}{8}\)
x. \(\dfrac{-3}{5}\) = \(\dfrac{7}{8}\)
x = \(\dfrac{7}{8}\):\(\dfrac{-3}{5}\)
x = \(\dfrac{7}{8}.\dfrac{5}{-3}\)
x = \(\dfrac{-35}{24}\)
Vậy x = \(\dfrac{-35}{24}\)
