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An expression is any combination of values that can be evaluated. A value can be as a simple as a literal constant (such as the value 42), a variable or a function, or it can be the result of an operation. Simple expressions can be combined with operators to produce more complex expressions.

Expressions are evaluated according to the rules of precedence. In mathematics, we use the following order of precedence is: parenthesis, exponent, multiply, divide, add and subtract (which gives us the acronym PEMDAS).

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