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Algebra Repost

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How can I transform the equation 4=x-y into one that begins with "y="?
Would I subtract x from both sides to get -x+4=-y? This doesn't look right at all.
Or would I add y to both sides and then subtract 4 to get y=x-4? This way seems more correct to me.
Please confirm which way is correct... thanks very much.

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