Răspuns:
[tex]x + \frac{3}{5} + x = 180 \\ \\ \frac{2 \times x \times 5 + 3}{5} = \frac{180 \times 5}{5} \\ 10x + 3 = 900 = > \\ x = \frac{897}{10} = 89,7[/tex]
