[tex]a,b - nr.[/tex]
[tex]a - b = 180[/tex]
[tex] \frac{1}{3} \times a = \frac{1}{7} \times b[/tex]
[tex] \frac{a}{3} = \frac{b}{7} [/tex]
[tex]7a = 3b[/tex]
[tex]a = \frac{3b}{7} [/tex]
[tex] \frac{3b}{7} - b = 180 \: | \times 7[/tex]
[tex]3b - 7b = 1260[/tex]
[tex] - 4b = 1260 \: | \div ( - 4)[/tex]
[tex]b = - 315[/tex]
[tex]a = \frac{3b}{7} [/tex]
[tex]a = \frac{3 \times ( - 315)}{7} [/tex]
[tex]a = - \frac{945}{7} [/tex]
[tex]a = - 135[/tex]
