Can someone explain to me how to solve this problem I’m really confused. I don’t even know where to start.

(20+x)+x=40

20+2x=40

2x=40-20

2x=20

x=20/2

x=10

Step-by-step explanation:

let the no. of games be x

and the no. of games won be 20+x

a 270° rotation about point p says on e d g e n u it y (had to space it out because it says it's a misspelling so i couldn't submit it