[tex]a - prima \: eleva[/tex]
[tex]b - a \: doua \: eleva[/tex]
[tex]a = \frac{1}{6} \times b + 35[/tex]
[tex]a = \frac{b}{6} + 35[/tex]
[tex]a + b = 84[/tex]
[tex] \frac{b}{6} + 35 + b = 84[/tex]
[tex] \frac{b}{6} + b = 84 - 35[/tex]
[tex] \frac{b}{6} + b = 49 \: | \times 6[/tex]
[tex]b + 6b = 294[/tex]
[tex]7b = 294[/tex]
[tex]b = \frac{294}{7} [/tex]
[tex]b = 42[/tex]
[tex]a = \frac{b}{6} + 35[/tex]
[tex]a = \frac{42}{6} + 35[/tex]
[tex]a = 7 + 35[/tex]
[tex]a = 42[/tex]
[tex] = > a = b = 42[/tex]
