Decompile with IDA, recreate functions in python3 with Z3 solver, run Z3 solver.
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I found the first base64 string that simply says "Not to easy man!!", but I believe the real flag is the base64 string "7MpfjlRZBmqpcFXHqpQ+41rnZFO3DNtZnoHtc8Kz1qA=". I just have no clue what that base64 string means or how to verify this.