If you already done the first step I made you already have all ready for run the command bellow on your terminal and start lein.
To run Clojure you can just type
lein repl on a Terminal.
The first problem show you the boolean on clojure are in this link
there are a few answers for (= __ true) some of them are
(= true true)
(= (not false) true)
(= (= 3 3) true)
any of these answers should give you the correct answer
HOW CLOJURE PROCESS THIS
First clojure will solve the operand '=' after this he will look for the next to parameters (true) | (not false) | (= 3 3) and will check if this is equals to the second (true) this is called Polish notation in this link you will find more details about that