Question

\(\dfrac{-3}{7}\) - \(\dfrac{2}{21}\) + (2\(\dfrac{2}{3}\) - 3\(\dfrac{1}{4}\)) = x - \(\dfrac{5}{3}\)

Answer 1

Ta có: \(-\dfrac{3}{7}-\dfrac{2}{21}+\left(2\dfrac{2}{3}-3\dfrac{1}{4}\right)=x-\dfrac{5}{3}\)

\(\Leftrightarrow x-\dfrac{5}{3}=-\dfrac{3}{7}-\dfrac{2}{21}+\dfrac{8}{3}-\dfrac{13}{4}\)

\(\Leftrightarrow x-\dfrac{5}{3}=-\dfrac{31}{28}\)

hay \(x=\dfrac{47}{84}\)

Vậy: \(x=\dfrac{47}{84}\)