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    You may consider to typeset the answer in white, instead of omiting it. This will make it invisible (although it could be selected from a pdf and pasted into an editor to make it visible). Or, if you are not asking about how to "leave the blank", but about how to allow the use of newlines inside the argument, then you have to use \long\def instead of \def. Commented Jan 21, 2017 at 20:41
  • I think this does the trick. I really don't need to insert blank space, my goal was more to create a 'teacher's copy' for my teaching assistants, in such a way that I can print a copy with solutions for them and a solution free one for the students. Commented Jan 21, 2017 at 21:16