What is 3y-6+7y-4y in simple form

At the newest animated movie, for every 9 children, there are 4 adults. there are a total of 39 children and adults at the movie.

Abox of chocolates costs $7. which equation relates the number of boxes sold (x) and total cost of the boxes sold (y)?

Write 5(6x+4)-2(5x-2) in the form a(bx+c) where a,b and c integers and a> 1