What would "x" be? and how do you get it?

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?

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x

Which of the following is the best first step in solving the equation below? 4+2㏒³x=17