[tex]2x - 0.3 = \frac{7}{10} \\ 2x = \frac{7}{10} + 0.3 \\ 2x = \frac{7}{10} + \frac{3}{10} \\ 2x = \frac{10}{10} \\ 2x = 1 \\ x = 1 \div 2 \\ x = 0.5[/tex]
