If
2x - 13 = 5
then
2x = 5 + 13 (we have in effect added 13 to both sides of the equation in this step)
2x = 18
x = 9.
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An equation has the 'equals' sign ( = ) in it. An expression hasn't.
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The equation 25 times 753 equals to 18825. This is 5 grade math.
In a math equation, something equals something else. You haven't given any equation to work with. I'm thinking you're looking to find 'x' when 'y' equals 2, when 'y' equals 3, etc. But we need some more info to help you.