cześć!
[tex] \frac{1}{5} + 3 = 10 - \frac{1}{2} x \\ \frac{1}{2} x = 10 - 3 - \frac{1}{5} \\ \frac{1}{2} x = 7 - \frac{1}{5} \\ \frac{1}{2} x = 6 \frac{4}{5} \\ \frac{1}{2} x = \frac{34}{5} \\ x = \frac{34}{5} \div \frac{1}{2} \\ x = \frac{34}{5} \times \frac{2}{1} \\ x = \frac{68}{5} = 13 \frac{3}{5} [/tex]
pozdrawiam!