Răspuns:
[tex]a = \frac{2b}{7} \\ \frac{5a + b}{3b - 2a} = \frac{ \frac{10b}{7} + b}{ \frac{21b - 4b}{7} } = \frac{17b}{7} \times \frac{7}{17b} = 1[/tex]
