What’s the answer having trouble

Which function has the same domain as y=2x

3382-299=3383- ? fill in the blank?

Oscar and julie ashton are celebrating their 15th anniversary by having a reception hall. they have budgeted $4,500 for their reception. if the reception hall charges a $90 cleanup fee plus & 36 per person, find the greatest number of people that they may invite and still stay within their budget.