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The video tutorial explains how to add two rational numbers using a number line. It begins with an introduction to the concept, followed by a detailed example of adding 3/6 and 4/6. The tutorial outlines the steps involved in representing the numbers on a number line and explains the direction of movement based on the sign of the numbers. The example concludes with the result of the addition, demonstrating that 3/6 plus 4/6 equals 7/6.

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