Yes -8-5=-13
-5-8=-13 try it with any number and it comes out the same unless you are multiplying in which case the answer is still yes.
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That is the commutative property of equality.
A unit in mathematics, specifically ring theory, is an element that can be inverted. I.e. x is a unit iff there exists some y such that xy=yx=1.
If this means "what is x when 8x = 9x?" then there is no answer in this Universe. If you want common multiples of 8 & 9 then 72 and all its multiples. (8 & 9 are examples of xy and yx.)
k = x y x = k/y
yx-3 is not an equation, and it has no graph.