Is x4yz3 divided by x3y3z simplified as xy-2z2?

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The expression x4yz3 divided by x3y3z simplifies to xz2/y2, not xy-2z2. The original answer, xy-2z2, is incorrect despite the understanding that y-2 can be represented as 1/y2. The discussion raises the question of whether an answer with negative exponents would be marked wrong in an exam context. Without explicit instructions to use only positive exponents, it remains uncertain how such an answer would be evaluated. The importance of clarity in mathematical simplification and notation is emphasized.
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Simplify:

x4yz3 / x3y3z

My answer was:
xy-2z2

However, the correct answer appears to be:

xz2 / y2

I know that y-2 is the same as 1/y2 so would my answer still be marked as wrong in an exam?
 
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Unless the problem specifically said "write with positive exponents only", it certainly should not be. Of course, I can't say if it would be or not!
 

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