\[\frac{x}{7} = - правильная\ дробь.\]
\[x = \left\{ 1;2;3;4;5;6 \right\}.\]
\[\frac{1}{7};\frac{2}{7};\frac{3}{7};\frac{4}{7};\frac{5}{7};\frac{6}{7}.\]