\(\left[ \begin{array}{l}x- \frac{7}{10} =\frac{-1}{5}\\x- \frac{7}{10} =\frac{1}{5}\end{array} \right.\)
→\(\left[ \begin{array}{l}x=\frac{1}{5}+\frac{7}{10}\\x=\frac{-1}{5}+\frac{7}{10}\end{array} \right.\)
→\(\left[ \begin{array}{l}x=\frac{9}{10}\\x=\frac{1}{2}\end{array} \right.\)