Question

Mng ơi giúp mình bài này với ạ

Answer 1

\(\dfrac{-2}{3}+\left(\dfrac{3}{4}-x\right)=\dfrac{4}{5}\\ \Rightarrow\dfrac{3}{4}-x=\dfrac{4}{5}+\dfrac{2}{3}=\dfrac{22}{15}\\ \Rightarrow x=\dfrac{3}{4}-\dfrac{22}{15}=-\dfrac{43}{60}\)