Verified answer

[tex]7 < 7x - 2 < 19 \\ 7 + 2 < 7x < 19 + 2 \\ 9 < 7x < 21 \: \: | \div 7 \\ 1 \frac{2}{7} < x < 3[/tex]

Ответ: х ∈ ( 1 2/7 ; 3 )