Question 1183600
Write it better, to be sure.



What exactly do you have, and is this complete?

Have you {{{z=x-8/(2x)}}}?
{{{z=x-(8/2)x}}}?
{{{z=(x-8)/(2x)}}}?
{{{z=(x-8/2)x}}}?



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You are going to need proper placement of grouping symbols.  You are not being clear enough without using them properly.