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I want to get y alone on one side, so if I subtract x from both sides, what would be x - x?

  • Algebra -

    x-x=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 = x-5 whatever x is.

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