tính một cách hợp lí

5,34.26.15+5,34.(126,15)

\(\dfrac{4}{5}+\left(\dfrac{-7}{6}\right)-\dfrac{1}{30}\)

\(\dfrac{x}{8}=\dfrac{-1}{4}\)

\(\dfrac{1}{6}=\dfrac{x}{18}\)

\(\dfrac{3}{4}x+\dfrac{1}{5}=\dfrac{1}{6}\)