How to find other solutions of a polynomial?

James is playing his favorite game at the arcade. after playing the game 3 times, he has 8 tokens remaining. he initially had 20 tokens, and the game costs the same number of tokens each time. the number tt of tokens james has is a function of gg, the number of games he plays

For which pair of functions is (gof)(a)=|a|-2?

What is the value of x in the equation 2(x-4) = 4(2x + 1)?