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Simplify this expression by substituting one number for x and a second number for y that have not been used in this discussion already:

Simplify this expression by substituting one number for x and a second number for y that have not been used in this discussion already:

uxzy

z-xy-y

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Bob,
Can you, at least, give us idea what's the rubric? or
Where did you get it from? What is the source? ...

No answers ... yet!