It doesn't always equal y or x. They're just convenient letters to use. You could use any letter or, for that matter, any symbol such as & or @.
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This is definitely false; if x=2 and y=3, x to the y power is 8, but y to the x power is 9, which are not equal.
x-y does not equal 10.
It equals n(x+y) / x*y.
x+y does not equal 10, which can be written x+y ~= 10 or x+y != 10.
X = 2 and Y = 3.