Bài 1 :
\(\frac{x}{3}-\frac{4}{5}=0,2\)
\(\frac{x}{3}-\frac{4}{5}=\frac{1}{5}\)
\(\frac{x}{3}=\frac{1}{5}+\frac{4}{5}\)
\(\frac{x}{3}=1\)
\(\Rightarrow x=3\)
Bài 2 :
\(\left(\frac{2}{5}-\frac{1}{3}\right)-x=\frac{5}{6}\)
\(\frac{1}{15}-x=\frac{5}{6}\)
\(x=\frac{1}{15}-\frac{5}{6}\)
\(x=\frac{-23}{30}\)