X/2 - 9
--------------------The expression. ( most probably wrong, but left as an illustrative lesson )
* * * * *
I would say 9 - x/2
Added:
On further reflection I am inclined to agree and defer to this second answer.
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-12 = x+9 x+9 -9 = -12 -9 x = -21
1.5x
13
2x + 9
X = Y = 9 The answer must be 9, since it says it in the problem. x = 9, y=9, and x = y are all true based on the given info.