Please help me find x and y

Hector and alex traded video games. alex gave hector one fourth of his video games in exchange for 6 video games. then he sold 3 video games and gave 2 video games to his brother. alex ended up with 16 video games. how many video games did alex have when he started?

Complete the solution of the equation. find the value of y when x equals -5. -4x - 8y = -52

The difference of two numbers is 40. find the numbers if 0.3 parts of one number is equal to 37.5% of the other one.