• A mathematical expression can be as simple as 2 + 4 or as complex as -4xy + 8x- 5(x/y). All mathematical expressions contain terms, and each term has a coefficient, the numerical factor. The terms are separated by plus or minus signs and consist of a product of the coefficient and one or more variables factors.

• In algebra, an equation can be defined as a mathematical statement consisting of an equal symbol between two algebraic expressions that have the same value. The most basic and common algebraic equations in math consist of one or more variables.

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