Algebra
posted by Casey .
x+y=x5
I want to get y alone on one side, so if I subtract x from both sides, what would be x  x?

xx=0, so y = 5
whatever value x has, the equation is still true. You cannot solve for y in terms of x, because y is independent of x in this case.
If you have 3=3, then x+3 = x+3 whatever x is.
Here, y = 5, so x+y = x5 whatever x is.
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