Question

m-n/3a-b=f+q/k
Найти а?

Answer 1

$frac{m-n}{3a-b}=frac{f+g}{k}\\3a-b=frac{kcdot (m-n)}{f+g}\\3a=b+frac{kcdot (m-n)}{f+g}\\a=frac{bcdot (f+g)+kcdot (m-n)}{3cdot (f+g)}$