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Best Answer
To "Solve" for Y which means get it on one side of the equals sign and everything else on the other side, write out your equation.
Y + X = 3
You want to get Y by itself so you would want to remove (transfer) the rest of the equation to the other side. Since X is the only thing on that side and it's positive (adding X) you will remove it. Make sure you do this to both sides though.
Y + X - X = 3 - X (simplify)
Y = 3 - X
There's your answer.
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