Write programs in Varlang

(4 pt) Write 2 different let expressions using the syntax of Varlang such that each expression evaluates to value 21. Each expression must include at least 2 nested let expressions and there must be a hole in one of the scopes.(The definition of this is seen in section 3.3 of Rajan-PL book pg 48), For example:

(let ((x 2) (y 4)) (let ((x 5) (z 10)) (let ((z 1)) (+ (* x y) z))))

$ 21