"You have an invalid left-hand side of an assignment operator. Remember that = in programming is for assignment not the same thing as in math."
"If the user is trying to assign a value to x but doing it backwards, x = x + x will work every time - it's doubling the value of x."
The article discusses a common programming mistake where a user incorrectly tries to compile x + x = x. This syntax fails because '=' signifies an assignment rather than a mathematical equality. Instead, the correct approach is to write x = x + x, which properly assigns the result of adding x to itself back to x. This emphasizes the distinction in programming between mathematical expressions and assignment operations.
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