The equation you provided is an equation with two variables, x and y, and an unknown constant value of 18. There is no specific question or instruction mentioned in your statement, so it is unclear what you are asking for.
If you want to solve for x or y, you would need additional information or another equation to form a system of equations. Otherwise, this equation is an expression of the relationship between x and y when 18 is added to y.
18 + y = x
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