Writing Equations from word problems Can you show me how to write the equation and solve it

5. Paul owns a set of model cars. His brother gives him 3 more sets for his birthday. Then Paul gives 1 set to a friend who really likes model cars but doesn't have any. Now Paul has 30 model cars left. How many model cars are in each set? 6. Tanner likes to collect comic books. He has 3 sets of same title comics and 5 other comic books. His friend, Scott, has 1 set (the same as Tanner's) and 19 other comics. The total number of comic books owned by Tanner and Scott is the same. How many books are in each set? 7. Erin can buy 5 putt-putt tickets and 2 one dollar boxes of popcorn for the same price as 3 putt-putt tickets and 12 one dollar boxes of popcorn. How much does each putt-putt ticket cost