If there is no = sign it is an expression but if there is an = sign it is an equation
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Expression has no answer. a equation has an answer
An equation is a ploblem with no answer and an expression is a problem with an answer so you'll get different answers with an equation and an expression.
equation is an expression equated to a value..what you have written is an expression. when equated to a value or any other expression makes it an equation.
The LHS expression = RHS expression
Simply put, an expression does not need an equal sign, while an equation does. Equation: x+y=z Expression: x+y