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An expression is a combination of numbers, operators, grouping symbols (such as brackets and parentheses) and/or free variables and bound variables arranged in a meaningful way which can be evaluated. Bound variables are assigned values within the expression (they are for internal use) while free variables can take on values from outside the expression.

Simplifying expressions requires a lot of practice. First, you need to have a clear and thorough understanding of the properties of integers and real numbers. Even though these properties may look obvious, it becomes difficult to identify them in given expressions.

How many legs in total do a chicken, a duck, and two sheep have?