a) -x+\(\frac{2}{5}\)=\(\frac{3}{10}\)
-x=\(\frac{3}{10}\)\(-\)\(\frac{2}{5}\)
\(-1.x\)=\(\frac{3}{10}-\frac{4}{10}\)
\(-1.x=\frac{-1}{10}\)
\(x=\frac{-1}{10}:-1\)
\(x=\frac{1}{10}\)
b)\(-x+\frac{3}{10}=1\)
\(-x=1-\frac{3}{10}\)
\(-x=\frac{10}{10}-\frac{3}{10}\)
\(-x=\frac{7}{10}\)
\(=>x=\frac{-7}{10}\)