y - x
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As a term of an expression: x-y
The browser used for posting questions on this site is almost totally useless for mathematical questions because most symbols are rejected, and special fonts, such as superscripts, are not recognised.So, assuming y = (x + 3)^2, then if x = 5, y = 64.
If your equation was x + 4y = 12, then: x + 4y = 12 → 4y = -x + 12 ← y = -x/4 + 3 If your equation was x = 4y + 12, then: x = 4y + 12 → 4y + 12 = x → 4y = x - 12 → y = x/4 - 3
This phrase might be represented by the mathematical expression Y + (-5x). Because there is no additional information, you cannot determine what either Y or x is.
The browser used for posting questions on this site is mostly useless for mathematical questions since it strips out most symbols. It is, therefore, not possible to tell what the expression is nor where any equality (or inequality) symbol might be.