Question

22 va rog nu răspunde-ți prosti dau coroana ​

Answer 1

$\frac{7a + b}{a + 3b} = 2 \implies7a + b = 2a + 6b \\ \implies \: 5a = 5b\iff \: a = b \\ \\ \\ \iff \: \frac{a + b}{a + 3b} = \frac{b + b}{b + 3b} = \frac{2b}{4b} = \frac{1}{2}$