Question

7f+g=5 solve for the variable f

Answer 1

7f+g=5 -- subtract g
7f=5-g -- divide by 7

f=(5-g)/7

Answer 2

$7f+g=5\ \ \ \ | subtract\ g\\\\ 7f=5-g\ \ \ \ | divide\ by\ 7\\\\ f=\frac{5-g}{7}$