Using a Variable to Simplify Patterns: Instead of repeating calculations, a variable (like $x$) can represent a changing value, helping us create a general formula.

Expressions with One Variable: Expressions like $20 + 5x$ or $50 – 3y$ show how a variable allows quick calculations for different amounts.

Substituting Values for the Variable: By replacing the variable with any number, we can easily find specific results without recalculating each time.

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