Evaluate an expression with one variable ex 1, x + 5; x = 3

The video tutorial begins with a simple math problem, evaluating the expression X + 5 when X equals 3. The teacher explains the concept of variables as unknowns and demonstrates how to assign a value to a variable. By substituting the value of 3 for X, the expression becomes 3 + 5, which is then solved to give the result of 8. The tutorial emphasizes understanding variables and basic arithmetic operations.

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