What’s the answer to 5 + 2x = 2x + 6

For how answer my question this will be the last question can you answer in math subject

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online

You receive 15% of the profit from a car wash how much money do you receive from a profit of 300