Hello Everybody,

I need help in solving this question. The equation is:

The question is to:

determine all the solutions in Z(17) and in Z(20).

[In Z(17): 9 and 14, in Z(20): none ]

NOTE::

The Z(17) is suppose to be the whole numbers symbol with subscript 17 but i don't know how to do it in Latex. The same applies to Z(20).

Thanks for your help.