Theory of Programing Language class

I would like you to add some explanations for each step, thank you!!

1. Identify all of the free variable occurrences in the Lambda Calculus expression below: ((x.x((xx)y))(u.u(vx))) 2. Identify all of the variable occurrences that are bound to the underlined binding occurrence in the Lambda Calculus expression below: (y.(yyy(yz.Z))z.yx)