[tex] \frac{1}{5} (2xy + 20 + 3xy + 40x) = [/tex]
[tex] \frac{1}{5} (5xy + 40x + 20)[/tex]
[tex] \frac{5xy}{5} + \frac{40x}{5} + \frac{20}{5} [/tex]
[tex]xy + 8x + 4[/tex]
