Question 400704
cross multiply and you get
a-7b=(a+7b)(-3k-8)
a-7b=-3ak-8a-21bk-56b
a+3ak+8a=7b-21bk-56b
9a+3ak=-49b-21bk
a(9+3k)=-49b-21bk
{{{a=(-49b-21bk)/(9+3k)}}}