Question

m-n/3a-b=f+q/k
Найти а?

Answer 1

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