[tex] \frac{3}{10} y - 4 = - 13 + \frac{y}{10} \\ \frac{3}{10} y - \frac{y}{10} = - 13 + 4 \\ \frac{2}{10} y = - 9 \\ y = - 9 \div \frac{1}{5} \\ y = - 45[/tex]