[tex]7(x - 0.6) = 4x + \frac{2}{5} [/tex]
[tex]7x - 7 \times 0.6 = 4x + 0.4[/tex]
[tex]7x - 4.2 = 4x + 0.4[/tex]
[tex]7x = 4x + 0.4 + 4.2[/tex]
[tex]7x = 4x + 4.6[/tex]
[tex]3x = 4.6[/tex]
[tex]x = 4.6 \div 3[/tex]
[tex]x = \frac{46}{10} \times \frac{1}{3} = \frac{46}{30} = \frac{23}{15} [/tex]
