There seem to be some problems. First, in the statement of the problem, I think the correct solution is z=3, not z=4. Second, in the test problems, the function solution() is called with an argument of x. It needs to be solution(x1,x2).
... also, in test #3, the solution is compared to y_correct rather than z_correct.
The problem description and test suite have been cleaned up.
It's an un-document usage of varargout!!!
I solved it in my cell phone.
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