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An expression or algebraic expression is a mathematical expression involving constants, variables and algebraic operations.
For example : 3x³ - 2y + 5(m/n)

An equation is a mathematical statement saying values of two expression are equal.
For example:  3x³ -2x = 5y + x²
1 5 1
Experssion is a set of algbraic terms seperated by '+' or' -' sign.

Equation is when there are two expresions seperated by '=' sign