addition,subtraction,multiplication,division
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Constants (numbers), variables, the four basic operations of arithmetic (+, -, *, /) as well as brackets and indices (including negative and fractional ones).
algebraic expression consists of numbers and operations
An algebraic structure is a set with certain operations defined on the set.The set may consist of numbers but may be collections of matrices, or of permutations and, the operations will depend on the elements of the set.
because you are stupid...
x+x use inverse operations