book Maths Puzzle Numerical Ability

Could you please show me all steps taken to obtain the profit functions (algebraically) for the following word problem:

A Company produces lage stuffed toys to be sold to showgr

Read Solution (Total 0)

book Other Question

2(12-8x)=x-11x x^2-9y^2
_________ / (x^2-3xy)
7x^2+21y

This is what I have so far...

(x-3y)(x+3y) over (?) * (times) 1 over (x^2-3xy)

I cant figure out how to factor the denomoniator i